Ändra sökning
Avgränsa sökresultatet
123 101 - 127 av 127
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 101.
    Muthukumar, Kaliappan
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Metallofullerenes in Technology: Doping and Surface Binding2008Konferensbidrag (Refereegranskat)
  • 102.
    Muthukumar, Kaliappan
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Structural and Electronic Characterization of Ce2@C80: Insights through DFT Computations2007Konferensbidrag (Refereegranskat)
  • 103.
    Muthukumar, Kaliappan
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Structural and Electronic Properties of Cerium Containing (Ce@C60; Ce@C80; Ce@C82 and Ce2@C80) Metallofullerenes2008Konferensbidrag (Refereegranskat)
  • 104.
    Muthukumar, Kaliappan
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    The role of ellipticity on the preferential binding site of Ce and la in C78-D3h: A density functional theory study2010Ingår i: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 2, nr 7, s. 1250-1255Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Endohedral metallofullerenes that encapsulate one or several atoms, or a cluster of atoms have molecular properties making them useful both in technology and in bio-medical applications. Some fullerenes are found to have two metal atoms incarcerated and it has been recently found that two Ce atoms are incorporated into the C78-D3h (78:5) cage. In this study, we report calculations on the structural and electronic properties of Ce 2@C78 using density functional theory (DFT). While Ce 2@C80-Ih (D3d) and La 2@C80-Ih (D2h) have different ground state structures, we have found that Ce2@C78 has a D 3h ground state structure just as La2@C78. The encapsulated Ce atoms bind strongly to the C78-D3h cage with a binding energy (BE) of 5.925 eV but not as strong as in Ce@C 82-C2v nor in Ce2@C80-Ih. The elliptical nature of the cage plays a crucial role and accommodates the two Ce atoms at opposite ends of the C3 axis with a maximized inter atomic distance (4.078 Å). This means that the effect of the additional f-electron repulsion in M2@C78 with M = Ce compared to M = La, is less pronounced than in Ce2@C80 compared to La2@C80. We compare the results to the elliptical M 2@C72 (#10611) (M = La, Ce), and with a range of additional Ce and La endohedral fullerenes and explain the role ellipticity has in the preferential binding site of Ce and shed light on the formation mechanism of these nanostructures

  • 105.
    Muthukumar, Kaliappan
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Schulte, Kristina H.G.
    AX-lab, Lund University.
    Moriarty, Philip J.
    School of Physics and Astronomy, University of Nottingham.
    Stróżecka, Anna
    Institut für Bio- and Nanosysteme (IBN 3) and CNI – Forschungszentrum Jülich.
    Voigtländer, Bert
    Institut für Bio- and Nanosysteme (IBN 3) and CNI – Forschungszentrum Jülich.
    Structural, Vibrational, and Electronic Characterization of Ce@C82: A Joint DFT and Experimental Study2007Konferensbidrag (Refereegranskat)
  • 106.
    Muthukumar, Kaliappan
    et al.
    Tyndall National Institute, Computational Modelling Group, University College Cork.
    Larsson, Andreas
    Strózecka, Anna
    Institut für Bio- and Nanosysteme (IBN 3) and CNI – Forschungszentrum Jülich.
    Voigtländer, Bert
    Institut für Bio- and Nanosysteme (IBN 3) and CNI – Forschungszentrum Jülich.
    Theoretical explanation of the nature of free and surface bound cerium endohedral fullerenes2009Konferensbidrag (Refereegranskat)
    Abstract [en]

    Cerium is one of the most reactive elements of the rare earth group, and its complex physics accompanying its single occupied 4f band, close to the Fermi level, has baffled scientists for many decades. Cerium can be encapsulated into fullerene (C72, C78, C80 and C82) cages, which works as an n-dopant. Metallofullerenes can be used as quantum bits in quantum computers, as molecular devices and as MRI contrasting agents. Here we address the challenges in modelling cerium endohedral fullerenes using density functional theory (DFT) and report our theoretical inspection that gives a detailed picture of metal-cage interaction and a closer look on the electronic structure of these cerium doped fullerenes. Experimental and theoretical results for these endohedral species bound to Cu(111) will also be presented with a fundamental and applied viewpoint to expand our knowledge about endohedral fullerene-surface interaction. We have found that the conductance of empty C60 to be much higher than the endohedrally doped cerium fullerene Ce2@C80 when bound to the same Cu(111) surface using low-temperature scanning tunnelling microscopy (LT-STM), which we explain through DFT calculations.

  • 107.
    Nolan, Michael
    et al.
    NMRC, University College, Lee Maltings, Cork.
    Larsson, Andreas
    Greer, James C.
    NMRC, University College, Lee Maltings, Cork.
    Band structure engineering of a molecular wire system composed of dimercaptoacetoamidobenzene, its derivatives, and gold clusters2002Konferensbidrag (Refereegranskat)
  • 108.
    Nolan, Michael
    et al.
    NMRC, University College, Lee Maltings, Cork.
    Larsson, Andreas
    Greer, James C.
    NMRC, University College, Lee Maltings, Cork.
    Band structure engineering of a molecular wire system composed of dimercaptoacetoamidobenzene, its derivatives, and gold clusters2003Ingår i: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 27, nr 1-2, s. 166-174Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The properties of molecular devices can be engineered through modification of the conformation of the molecule and through chemical substitution. The following study presents the results of density functional theory studies of the properties of a metal-molecule assembly resulting from the interaction between an organic molecular linker, dimercaptoacetoamidobenzene and thirteen atom "magic number" gold nanoclusters. Bonding between two gold nanoclusters, changing the conformation of the linker molecule and the effect of chemical substitution in the linker are assessed through considering the geometry and electronic structure of the resulting assemblies. Changing the conformation in the molecule leads to significant changes in the electronic structure of the metal-linker-metal complex. Chemical substitution in the molecular wire also has an effect on the electronic structure; however, energy level shifts are larger for conformational changes than for chemical substitution

  • 109.
    Nolan, Michael
    et al.
    NMRC, University College, Lee Maltings, Cork.
    Larsson, Andreas
    Greer, James C.
    NMRC, University College, Lee Maltings, Cork.
    Wessels, J.M.
    Ab-initio Studies of the Interaction Between a Molecular Wire and a Au13 Cluster2001Konferensbidrag (Refereegranskat)
  • 110.
    Nolan, Michael
    et al.
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Larsson, Andreas
    Tong, Longyu
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Murtagh, Martin E.
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Greer, James C.
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Photodissociation of hydrogen passivated dopants in gallium-arsenide2000Konferensbidrag (Refereegranskat)
  • 111.
    O'Byrne, Justin P.
    et al.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Li, Zhong
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Jones, Sarah Louise T.
    Electronics Theory Group, Tyndall National Institute, Cork.
    Fleming, Peter G.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Morris, Michael A.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Holmes, Justin D.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Nitrogen-doped carbon nanotubes: Growth, mechanism and structure2011Ingår i: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 12, nr 16, s. 2995-3001Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nitrogen-doped bamboo-structured carbon nanotubes have been successfully grown using a series of cobalt/molybdenum catalysts. The morphology and structure of the nanotubes were analysed by transmission electron microscopy and Raman spectroscopy. The level of nitrogen doping, as determined by X-ray photoelectron spectroscopy, was found to range between 0.5 to 2.5 at. %. The growth of bamboo-structured nanotubes in the presence of nitrogen, in preference to single-walled and multi-walled nanotubes, was due to the greater binding energy of nitrogen for cobalt in the catalyst compared to the binding strength of carbon to cobalt, as determined by density functional theory

  • 112.
    O'Byrne, Justin P.
    et al.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Li, Zhong
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Tobin, Joseph M.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Larsson, Peter O.
    Department of Physics, Condensed Matter Theory Group, Uppsala University.
    Ahuja, Rajeev B.
    Department of Physics, Condensed Matter Theory Group, Uppsala University.
    Holmes, Justin D.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Growth of carbon nanotubes from heterometallic palladium and copper catalysts2010Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, nr 18, s. 8115-8119Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Bamboo-structured carbon nanotubes (BCNTs) were synthesized with MgO-supported Pd and Cu catalysts, doped with either Mo or W, by the catalytic chemical vapor decomposition of methane. No nanotubes were observed to grow from the catalysts in the absence of the dopant metals. Additionally, the level of dopant in the catalysts was found to strongly affect the morphology of carbon produced. Amorphous carbon was generated on a 10 wt % Cu/5 wt % W (2:1) catalyst, while BCNTs were produced on 20 wt % Cu/5 wt % W (4:1) and a 30 wt % Cu/5 wt % W (6:1) catalysts. A pure Pd catalyst produced carbon nanofibres (CNFs), while BCNTs were able to grow from Pd/Mo catalysts. Density functional theory simulations show that the composite Cu/W and Pd/Mo bimetallic particles which generated BCNTs have similar binding energies to carbon, and comparable to metals such as Fe, Co, and Ni which are traditionally used to grow CNTs by chemical vapor deposition

  • 113.
    O'Byrne, Justin P.
    et al.
    Department of Chemistry, Materials Section and Supercritical Fluid Centre, University College Cork.
    Tobin, Joseph M.
    Department of Chemistry, Materials Section and Supercritical Fluid Centre, University College Cork.
    Li, Zhong
    Department of Chemistry, Materials Section and Supercritical Fluid Centre, University College Cork.
    Larsson, Andreas
    Holmes, Justin D.
    Department of Chemistry, Materials Section and Supercritical Fluid Centre, University College Cork.
    Novel catalysts for carbon nanotube and nanofibre synthesis2009Konferensbidrag (Refereegranskat)
    Abstract [en]

    Carbon nanotubes are of huge interest to the scientific community for their physical and electronic properties[1]. We have synthesized carbon nanotubes (CNTs) on novel non-traditonal catalysts. Bamboo-shaped carbon nanotubes (BCNTs) were synthesized on Pd and Cu catalysts doped with either Mo or W. BCNTs were sythesised using the catalytic chemical vapour decomposition (CVD) of methane. Cu is catalytically inactive for the synthesis of CNTs; however this is not the case when Cu is doped with Mo[2] and W. When Cu is doped with these metals bamboo structured CNTs can be produced via a CVD synthesis method. The addition of a dopant alters the electronic structure of catalyst nanoparticle causing the binding strength between the nanoparticle and carbon to approach that of traditional catalysts for CNT growth i.e. Fe; Co; Ni and their alloys which has been shown by computer modeling. We have performed full geometry optimization DFT calculations of Cu/W and Pd/Mo particles of different compositions to determine their ability to stabilize and support the growing end of a CNT. We have computed a (5;0) SWNTs binding energy to a M13 metal cluster (M=Cu; W or Pd; Mo); which in a model system that has been proven to correctly predict the trends in bonding[2; 3]. The resulting binding energies are compared to Fe; Co; Ni and Cu/Mo clusters of these previous reports. All calculations were made using the generalized gradient approximation (GGA) exchange and correlation potential by Perdew-Burke-Ernzenhof [PBE]; utilizing the polarized valence triple-ζ (TZVP) basis set[4] and relativistic effective core potentials (ECPs) for Cu; Pd; W and Mo[5; 6]; as implemented in the Turbomole suite of programs[7-10].

  • 114. Rosén, Arne
    et al.
    Li, Y.
    Larsson, Andreas
    Barzegar, H.R.
    Wågberg, T.
    Experimental and theoretical analysis of carbon nanotubes grown from catalytic nanoparticles of defined size distribution2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    We report use of a dip-coating method to prepare catalyst particles (mixture of iron and cobalt) with a controlled diameter distribution on silicon wafer substrates by changing the solution concentration and withdrawal velocity. The size and distribution of the prepared catalyst particles were analyzed by atomic force microscopy. Carbon nanotubes were grown by chemical vapor deposition, CVD, on the substrates with the prepared catalyst particles. By decreasing the particle size, the growth of carbon nanotubes can be tuned from few walled carbon nanotubes, with homogeneous diameters, to highly pure single walled carbon nanotubes, SWNT. Analysis of the Raman radial breathing mode, showed a relatively broad diameter distribution (0.8-1.4 nm) of single walled carbon nanotubes, SWNT, with different chiralities. By changing the size and composition of the catalyst particles but maintain the growth parameters, the chiralities of SWNT were reduced to mainly four different types: (12,1), (12.0), (8,5) and (7,5) of which quantity is 70 % of all the nanotubes.

  • 115.
    Silvearv, Fredrik
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Larsson, Peter O.
    Department of Physics, University of Uppsala, Department of Physics, Condensed Matter Theory Group, Uppsala University, Division of Materials Theory, Department of Physics and Astronomy, Uppsala University.
    Jones, Sarah Louise T.
    Electronics Theory Group, Tyndall National Institute, Cork, Tyndall National Institute, University College Cork.
    Ahuja, Rajeev B.
    Division of Materials Theory, Department of Physics and Astronomy, Uppsala University, Department of Physics, Condensed Matter Theory Group, Uppsala University, Department of Physics, University of Uppsala, Applied Material Physics, Department of Materials and Engineering, Royal Institute of Technology (KTH).
    Larsson, Andreas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Establishing the most favorable metal-carbon bond strength for carbon nanotube catalysts2015Ingår i: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 3, nr 14, s. 3422-3427Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We have studied a wide range of transition metals to find potential carbon nanotube (CNT) catalysts for chemical vapor deposition (CVD) production. The adhesion strengths between a CNT and a metal cluster were calculated using first principle density functional theory (DFT) for all 1st, 2nd and 3rd row transition metals. We have developed the criterion that the metal-carbon adhesion strength per bond must fulfill a Goldilocks principle for catalyzing CNT growth and used it to identify, besides the well known catalysts Fe, Co and Ni, a number of other potential catalysts, namely Y, Zr, Rh, Pd, La, Ce and Pt. Our results are consistent with previous experiments performed either in a carbon arc discharge environment or by a CVD-process with regard to CNT catalyst activity

  • 116.
    Stróecka, Anna
    et al.
    Peter Grünberg Institut (PGI-3), JARA, Forschungszentrum Jülich.
    Muthukumar, Kaliappan
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Mysliveček, Josef
    Charles University, Faculty of Mathematics and Physic.
    Voigtländer, Bert
    Peter Grünberg Institut (PGI-3), JARA, Forschungszentrum Jülich.
    Phonon-assisted transport through a single endohedrally doped fullerene2008Konferensbidrag (Refereegranskat)
  • 117.
    Stróecka, Anna
    et al.
    Institut für Bio- und Nanosysteme, Forschungszentrum Jülich.
    Muthukumar, Kaliappan
    Tyndall National Institute, University College Cork.
    Dybek, Aneta
    Department of Physics, Queen Mary University of London.
    Dennis, T. Jiohn S.
    Department of Physics, Queen Mary University of London.
    Larsson, Andreas
    Mysliveček, Josef
    Institut für Bio- und Nanosysteme, Forschungszentrum Jülich.
    Voigtländer, Bert
    Institut für Bio- und Nanosysteme, Forschungszentrum Jülich.
    Modification of the conductance of single fullerene molecules by endohedral doping2009Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 95, nr 13Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We use scanning tunneling microscopy to establish controlled contacts to single molecules of endohedrally doped Ce 2@C 80 fullerenes with C 60 as a reference. The stability of the experimental setup allows for the determination of the conductance of Ce 2@C 80 relative to the conductance of C 60. The endohedral doping reduces the conductance of Ce 2@C 80 by a factor of about five with respect to C 60. Ab initio calculations show that the reason for this reduced conductance is the absence of electron orbitals delocalized over the cage of Ce 2@C 80 in the energy window of the conductance measurement

  • 118.
    Stróecka, Anna
    et al.
    Peter Grünberg Institut (PGI-3), JARA, Forschungszentrum Jülich.
    Muthukumar, Kaliappan
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Dybek, Aneta
    Department of Physics, Queen Mary University of London.
    Dennis, T. John S.
    Department of Physics, Queen Mary University of London.
    Mysliveček, Josef
    Charles University, Faculty of Mathematics and Physic.
    Voigtländer, Bert
    Peter Grünberg Institut (PGI-3), JARA, Forschungszentrum Jülich.
    Electron-induced excitation of vibrations of Ce atoms inside a C 80 cage2011Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 83, nr 16Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Inelastic electron tunneling spectroscopy of Ce 2@C 80 dimetallofullerenes reveals a low-energy inelastic excitation that is interpreted using ab initio calculations and associated with the movements of encapsulated Ce atoms inside the C 80 cage. The electron-vibration interaction in Ce 2@C 80 is unusually high, inducing a pronounced zero-bias anomaly in differential conductance of Ce 2@C 80. Our observations show that the atoms encapsulated in fullerene cages can actively participate in determining the properties of molecular junctions

  • 119.
    Stróżecka, Anna
    et al.
    Peter Grünberg Institut (PGI-3), and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich.
    Muthukumar, Kaliappan
    Tyndall National Institute, University College Cork.
    Dybek, Aneta
    Department of Physics, Queen Mary University of London.
    Mysliveček, Josef
    Charles University, Faculty of Mathematics and Physic.
    Larsson, Andreas
    Dennis, John S.
    Department of Physics, Queen Mary University of London.
    Voigtländer, Bert
    Peter Grünberg Institut (PGI-3), and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich.
    Scanning Tunnelling Spectroscopy of Ce@C82 and Ce2@C80 Metallofullerenes2007Konferensbidrag (Refereegranskat)
  • 120.
    Stróżecka, Anna
    et al.
    Peter Grünberg Institut (PGI-3), and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich.
    Muthukumar, Kaliappan
    Tyndall National Institute, University College Cork.
    Dybek, Aneta
    Department of Physics, Queen Mary University of London.
    Mysliveček, Josef
    Charles University, Faculty of Mathematics and Physic.
    Larsson, Andreas
    Dennis, John S.
    Department of Physics, Queen Mary University of London.
    Voigtländer, Bert
    Peter Grünberg Institut (PGI-3), and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich.
    Scanning Tunneling Spectroscopy of Cerium Metallofullerenes2007Konferensbidrag (Refereegranskat)
  • 121.
    Thompson, Damien J.
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    A molecular dynamics free energy study of competitive guest binding to β-cyclodextrin2005Konferensbidrag (Refereegranskat)
  • 122.
    Thompson, Damien J.
    et al.
    Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Modeling competitive guest binding to β-cyclodextrin molecular printboards2006Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 110, nr 33, s. 16640-16645Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Anchoring of functionalized guest molecules to self-assembled monolayers (SAMs) is key to the development of molecular printboards for nanopatterning. One very promising system involves guest binding to immobilized β-cyclodextrin (β-CD) hosts, with guest:host recognition facilitated by a hydrophobic interaction between uncharged anchor groups on the guest molecule and β-CD hosts self-assembled at gold surfaces. We use molecular dynamics free energy (MDFE) simulations to describe the specificity of guest:β-CD association. We find good agreement with experimental thermodynamic measurements for binding enthalpy differences between three commonly used phenyl guests: benzene, toluene, and t-butylbenzene. van der Waals interaction with the inside of the host cavity accounts for almost all of the net stabilization of the larger phenyl guests in β-CD. Partial and full methylation of the secondary rim of β-CD decreases host rigidity and significantly impairs binding of both phenyl and larger adamantane guest molecules. The β-CD cavity is also very intolerant of guest charging, penalizing the oxidized state of ferrocene by at least 7 kcal/mol. β-CD hence expresses moderate specificity toward uncharged organic guest molecules by van der Waals recognition, with a much higher specificity calculated for electrostatic recognition of organometallic guests.

  • 123.
    Tong, L.
    et al.
    University College, Lee Maltings, Cork.
    Larsson, Andreas
    Nolan, Michael
    University College, Lee Maltings, Cork.
    Murtagh, M.
    University College, Lee Maltings, Cork.
    Greer, James C.
    University College, Lee Maltings, Cork.
    Barbe, M.
    CNRS : UMR8635 – Université de Versailles Saint-Quentin-en-Yvelines (UVSQ).
    Chevalier, J.
    CNRS : UMR8635 – Université de Versailles Saint-Quentin-en-Yvelines (UVSQ).
    Silvestre, S.
    CNRS : UMR8520 – Institut supérieur de l'électronique et du nunérique (ISEN) – Université Lille.
    Loridant-Bernard, D.
    CNRS : UMR8520 – Institut supérieur de l'électronique et du nunérique (ISEN) – Université Lille.
    Constant, E.
    CNRS : UMR8520 – Institut supérieur de l'électronique et du nunérique (ISEN) – Université Lille.
    Constant, M.
    Université Lille I - Sciences et technologies – CNRS : UMR8516.
    Photodissociation of hydrogen passivated dopants in gallium arsenide2001Konferensbidrag (Refereegranskat)
  • 124.
    Tong, Longyu
    et al.
    NMRC, University College, Lee Maltings, Cork.
    Larsson, Andreas
    Nolan, Michael
    NMRC, University College, Lee Maltings, Cork.
    Cheng, Tongwei
    NMRC, University College, Lee Maltings, Cork.
    Nurthag, M.
    NMRC, University College, Lee Maltings, Cork.
    Greer, James C.
    NMRC, University College, Lee Maltings, Cork.
    Accurate calculations of electronic excitation spectra with Cl2000Konferensbidrag (Refereegranskat)
  • 125.
    Tong, Longyu
    et al.
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Larsson, Andreas
    Nolan, Michael
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Murtagh, MArtin E.
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Greer, James C.
    National Microelectronics Research Centre (NMRC), University College, Lee Maltings, Prospect Row, Cork.
    Barbe, Michel
    Laboratoire de Physique des Solides et de Cristallogénèse, CNRS, 1 Place A. Briand, 92195 Meudon Cedex.
    Bailly, Francis
    Laboratoire de Physique des Solides et de Cristallogénèse, CNRS, 1 Place A. Briand, 92195 Meudon Cedex.
    Chevallier, Jacques
    Laboratoire de Physique des Solides et de Cristallogénèse, CNRS, 1 Place A. Briand, 92195 Meudon Cedex.
    Silvestre, F.S.
    IEMN, UMR CNRS 9929, BP69, Avenue Poincaré, 59652 Villeneuve d'Ascq Cedex.
    Loridant-Bernard, D.
    IEMN, UMR CNRS 9929, BP69, Avenue Poincaré, 59652 Villeneuve d'Ascq Cedex.
    Constant, E.
    IEMN, UMR CNRS 9929, BP69, Avenue Poincaré, 59652 Villeneuve d'Ascq Cedex.
    Constant, F.M.
    Laboratoire de Spectrochimie Infrarouge et Raman, UPR2631L CNRS, Université des Sciences et Techniques de Lille.
    Photo-dissociation of hydrogen passivated dopants in gallium arsenide2002Ingår i: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 186, nr 1-4, s. 234-239Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A theoretical and experimental study of the photo-dissociation mechanisms of hydrogen passivated n- and p-type dopants in gallium arsenide is presented. The photo-induced dissociation of the Si Ga-H complex has been observed for relatively low photon energies (3.48 eV), whereas the photo-dissociation of C As-H is not observed for photon energies up to 5.58 eV. This fundamental difference in the photo-dissociation behavior between the two dopants is explained in terms of the localized excitation energies about the Si-H and C-H bonds.

  • 126.
    Ton-That, Cuong
    et al.
    Nanoscience Centre, University of Cambridge.
    Welland, Mark E.
    Nanoscience Centre, University of Cambridge.
    Larsson, Andreas
    Greer, James C.
    Tyndall National Institute, University College Cork.
    Shard, Alex G.
    Department of Engineering Materials, Sir Robert Hadfield Building, University of Sheffield.
    Dhanrk, Vinod R.
    SRS Daresbury Laboratory and Physics Department, University of Liverpool.
    Taninaka, Atsushi
    Department of Chemistry, Nagoya University.
    Shinohara, Hisanori
    Department of Chemistry, Nagoya University.
    Electrostatic ordering of the lanthanum endoatom in La@C 82 adsorbed on metal surfaces2005Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 71, nr 4Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An investigation of the dynamic behavior of the endohedral La atom in La@C 82 adsorbed on Ag(111) or Cu(111) using the normal-incidence x-ray standing wavefield (NIXSW) technique is presented. For the surface-normal (111) reflection, NIXSW demonstrates different La absorption profiles between the La@C 82 monolayer and multilayer. Analysis of the profiles reveals significant La ordering in the monolayer; the degree of ordering increases as the film is cooled. First-principles calculations provide a description of the endohedral metal atom-cage bonding and the fullerene-surface interaction. Combined, these effects give rise to preferential binding sites for the endoatom resulting from electrostatic interactions within the adsorbed fullerene

  • 127. Twamley, J.
    et al.
    Beton, P.
    Moriarity, P.
    Keeling, D.
    Butcher, M.
    Humphrey, M.
    Dunsch, L.
    Georgi, P.
    Wang, C-R
    Greer, J.C.
    Larsson, Andreas
    Smith, R.
    Godwin, P.
    Suter, D.
    Udovicic, L.
    Fleger, M.
    Li, H.
    Kim, K.W.
    Weidinger, A.
    Harneit, W.
    Waiblinger, M.
    Welland, M.
    Durkan, C.
    A study about the possibility of constructing a scalable quantum informatioon device using doped fullerenes2001Konferensbidrag (Refereegranskat)
123 101 - 127 av 127
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf