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Journal of Chemical Physics / Volume 130 / Issue 17 / ARTICLES / Gas Phase Dynamics and Structure: Spectroscopy, Molecular Interactions, Scattering, and Photochemistry

J. Chem. Phys. 130, 174303 (2009); http://dx.doi.org/10.1063/1.3125968 (5 pages)

Doppler widths in electron quasielastic scattering from molecular gases

R. Moreh1 and D. Nemirovsky2

1Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
2Sami Shamoon College of Engineering, Beer-Sheva 84100, Israel

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(Received 6 March 2009; accepted 7 April 2009; published online 1 May 2009)

Recent quasielastic electron scattering experiments on some molecular gases at Ee ≥ 1.8 keV have shown that the scattering is from single isotopes of the atomic components of the gas. The scattered electron lines at definite angles are Doppler broadened by the instantaneous kinetic energy (KE) of the scattering atoms. We calculated the KE of the scattering atoms by accounting for translation, rotation, and all normal modes of vibrations of the molecule. The results reveal some large and fundamental differences from literature estimates.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. CALCULATIONS
    1. KE of the H-atom in H2
    2. KE of the H-atom in HD
    3. KE of the D-atom in D2 and HD
    4. KEs of the H- and D-atoms in CH4 and CD4
    5. KE of the C-atom in CH4 and in CD4
    6. KE of the H- and C-atoms in C2H4
  3. DISCUSSION
    1. KE difference of H in H2 and HD
    2. Comparison with literature KE results in CH4 and C2H4
    3. Effect on Doppler width and instrumental resolution
  4. SUMMARY

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KEYWORDS and PACS

Keywords

deuterium, Doppler broadening, hydrogen neutral molecules, isotope effects, molecule-electron collisions, organic compounds, rotational states, translational states, vibrational states

PACS

  • 34.80.Bm

    Elastic scattering

  • 33.20.Sn

    Rotational analysis

  • 33.70.Jg

    Line and band widths, shapes, and shifts

  • 33.15.Mt

    Rotation, vibration, and vibration-rotation constants

  • 33.20.Tp

    Vibrational analysis

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3125968

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    M. Vos, Phys. Rev. A 65, 012703 (2001).

    G. Cooper, E. Christensen, and A. P. Hitchcock, J. Chem. Phys. 127, 084315 (2007)JCPSA6000127000008084315000001.

    G. Cooper, A. P. Hitchcock, and C. A. Chatzidimitriou-Dreismann, Phys. Rev. Lett. 100, 043204 (2008).

    R. Moreh, D. Levant, and E. Kunoff, Phys. Rev. B 45, 742 (1992).

    R. Moreh, Y. Finkelstein, and H. Shechter, Phys. Rev. B 53, 16006 (1996).


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