Electric field effects on the absorption spectra ofH2near the ionization limit

Abstract
The absorption cross section of H2 has been measured in the region between 77.5 and 82.4 nm and the effects of electric fields up to 22 kV/cm on the cross sections have been investigated. The apparent cross section is found to be increased in the neighborhood of optically allowed transitions to npσΣu1+ and npπΠu1 states with n=4−7. This increase in absorption is attributed to field mixing with nearby optically forbidden states.