Übergangswahrscheinlichkeiten im Elektronen- und Schwingungsspektrum des Wasserstoffmoleküls

Abstract

The energy loss spectrum of electrons interacting with molecular hydrogen (natural and para hydrogen) has been measured by means of a high resolution technique recently developed. The primary electron energy was 30 keV, the energy resolution 0.01 eV. The spectra clearly show the rotational structure. FRANCK—CONDON overlap integrals have been computed for the LYMAN and WERNER bands using the WKB method and NAMIOKA’s potential curves. The experimental band intensities agree with these theoretical values much better than with FRANCE—CONDON factors obtained from MORSE functions. Some small discrepancies for the LYMAN bands may be referred to the dependence of the electron transition moment on the nuclear distance. In contrast to ultraviolet absorption spectra the predissociation edge at 14.7 eV could not be observed in the energy loss spectra.