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Energy loss of 18 keV electrons in gaseous T and quench condensed D films |
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| Authors: | V.N. Aseev A.I. Belesev A.I. Berlev E.V. Geraskin O.V. Kazachenko Yu.E. Kuznetsov V.M. Lobashev R.P. Ostroumov N.A. Titov S.V. Zadorozhny Yu.I. Zakharov J. Bonn B. Bornschein L. Bornschein E.W. Otten M. Przyrembel Ch. Weinheimer A. Saenz |
| Affiliation: | (1) Institute for Nuclear Research, Academy of Sciences of Russia, 60th October Anniversary Prospect 7a, 117312 Moscow, Russia, RU;(2) Institute of Physics, Joh. Gutenberg University, 55099 Mainz, Germany, DE;(3) Max-Planck-Institute for Quantum Optics, Theory Group, 85748 Garching, Germany, DE |
| Abstract: | Measurements of the energy loss of fast electrons at an energy of 18 keV have been performed on molecules of hydrogen isotopes, gaseous T 2 and frozen D 2 . Whereas in the case of gaseous T 2 the values of total inelastic cross-section ( cm2 for E = 18.6 keV), average energy loss ( eV) and peak position of the energy loss spectra ( eV) agree well with the expectations, the corresponding values for quench condensed D 2 differ significantly from the ones for gaseous T 2 . We observe a significant lower total inelastic cross-section ( cm2, for E = 18.6 keV) larger average energy loss ( eV) and higher peak position ( eV). These differences may be interpreted in terms of changes of the final state spectrum. A CI calculation for a D 2 cluster shows indeed a clear shift of the excited states in agreement with the observation. Received 24 August 1999 |
| Keywords: | PACS. 34.80.Gs Molecular excitation and ionization by electron impact - 78.90.+t Other topics in optical properties condensed matter spectroscopy and other interactions of particles and radiation with condensed matter |
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