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Träfflista för sökning "WFRF:(Hellberg F.) "

Search: WFRF:(Hellberg F.)

  • Result 11-20 of 49
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  • Aberg, J, et al. (author)
  • Electrical properties of the TiSi2-Si transition region in contacts : The influence of an interposed layer of Nb
  • 2001
  • In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 90:5, s. 2380-2388
  • Journal article (peer-reviewed)abstract
    • The influence of an interposed ultrathin Nb layer between Ti and Si on the silicide formation and the electrical contact between the silicide formed and the Si substrate is investigated. The presence of the Nb interlayer results in the formation of ternary alloy (Nb,Ti)Si-2 in the C40 crystallographic structure adjacent to the Si substrate. Depending on the nature of the Si substrates and/or the amount of the initial Nb, the interfacial C40 (Nb,Ti)Si-2 leads, in turn, to either epitaxial growth of a highly faulted metastable C40 TiSi2 or formation of the desired C54 TiSi2 at a lower temperature than needed for it to form in reference samples with Ti deposited directly on Si. On p-type substrates doped to various concentrations, the Nb also leads to a considerably lower specific contact resistivity than that obtained in the reference samples: a twofold to fourfold reduction in the contact resistivity is found using cross-bridge Kelvin structures in combination with two-dimensional numerical simulation. As C40 (Nb,Ti)Si-2 forms at the interface when an interfacial Nb is present, the interface characterized is likely to represent the one between (Nb,Ti)Si-2 and Si. For the reference samples, the interface studied is between TiSi2 and Si.
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  • Andersson, Patrik U, 1970, et al. (author)
  • Formation of Highly Rovibrationally Excited Ammonia from Dissociative Recombination of NH4
  • 2010
  • In: Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185. ; 1:17, s. 2519-2523
  • Journal article (peer-reviewed)abstract
    • The internal energy distribution of ammonia formed in the dissociative recombination (DR) of NH4+ with electrons has been studied by an imaging technique at the ion storage ring CRYRING. The DR process resulted in the formation of NH3 + H (0.90 ± 0.01), with minor contributions from channels producing NH2 + H2 (0.05 ± 0.01) and NH2 + 2H (0.04 ± 0.02). The formed NH3 molecules were highly internally excited, with a mean rovibrational energy of 3.3 ± 0.4 eV, which corresponds to 70% of the energy released in the neutralization process. The internal energy distribution was semiquantitatively reproduced by ab initio direct dynamics simulations, and the calculations suggested that the NH3 molecules are highly vibrationally excited while rotational excitation is limited. The high internal excitation and the translational energy of NH3 and H will influence their subsequent reactivity, an aspect that should be taken into account when developing detailed models of the interstellar medium and ammonia-containing plasmas.
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  • Ehlerding, A., et al. (author)
  • The dissociative recombination of fluorocarbon ions III : CF2+ and CF3
  • 2006
  • In: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 39:4, s. 805-812
  • Journal article (peer-reviewed)abstract
    • Cross sections and branching ratios are presented for the dissociative recombination of the CF2+ and C-3(+) ions with electrons. It is found that the channel producing CF + F is dominant for the reaction with CF2+ and the production of CF2 + F is dominant for the reaction with CF3+. The cross sections for these two ions are very similar.
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  • Result 11-20 of 49
Type of publication
journal article (44)
conference paper (4)
book (1)
Type of content
peer-reviewed (44)
other academic/artistic (4)
pop. science, debate, etc. (1)
Author/Editor
Hellberg, F (25)
Larsson, M (24)
Ehlerding, A (20)
Österdahl, Fabian (19)
Geppert, W D (17)
Kaminska, M (12)
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af Ugglas, M (11)
Semaniak, J (10)
Thomas, R (8)
Al-Khalili, A (7)
Danared, H. (4)
Persson, S (3)
Smith, U (3)
Kaplan, W (3)
Hanstorp, Dag, 1960 (3)
Pegg, D. J. (3)
Zhaunerchyk, Vitali (3)
Andersson, Patrik U, ... (3)
Paal, A (3)
Hamberg, M (3)
Hellberg, Fredrik (2)
Bengtsson, NO (2)
Hatschek, T (2)
Aberg, J (2)
Ericson, F (2)
Engstrom, M (2)
Johansson, C. (2)
Lundell, G (2)
Markovic, Nikola, 19 ... (2)
LINDBERG, B (2)
Glimelius, B (2)
Ost, A (2)
Larsson, Mats (2)
Cedermark, B (2)
Svensson, C (2)
Sandström, Joakim, 1 ... (2)
Henriksson, G (2)
Westman, M (2)
Nilsson, S. (2)
Rubio, C (2)
Bergstrom, S (2)
Uggerud, E (2)
Lindstrom, C (2)
Gustafsson, A (2)
Magnusson, I. (2)
Nilsson, E (2)
Tyden, G. (2)
Svensson, JO (2)
Thomas, Richard D. (2)
Bergman, L. (2)
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University
Royal Institute of Technology (25)
Karolinska Institutet (11)
Uppsala University (8)
University of Gothenburg (7)
Stockholm University (7)
Chalmers University of Technology (4)
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Linköping University (2)
Lund University (2)
Örebro University (1)
Jönköping University (1)
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Language
English (45)
Undefined language (4)
Research subject (UKÄ/SCB)
Natural sciences (24)
Medical and Health Sciences (5)
Engineering and Technology (3)

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