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
Springer Online Journal Archives 1860-2000
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.
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