Resonance-Enhanced Vibrational Excitation in Electron Scattering fromO2Multilayer Films

Abstract

Electron-impact intramolecular vibrational and vibronic excitation of disordered multilayer ${\mathrm{O}}_2$ films is studied with primary energies varying from 2 to 20 eV. The intensity of the $v=1\mathrm{}$ to $v=4\mathrm{}$ vibrational modes of ground state ${\mathrm{O}}_2$ exhibits a broad resonance as a function of electron energy. At the resonance maximum the vibrational intensities are enhanced by one to two orders of magnitude. The resonance appears to be derived from gas-phase ${\mathrm{O}}_2$ quasibound states.