The photoelectron spectrum of N 2 , and partial cross sections as a function of photon energy from 16 to 40 eV

Abstract

The Daresbury electron synchrotron has been used to provide photons from 16 to 40 eV for an investigation of the photoelectron spectrum of molecular nitrogen. A cylindrical mirror analyser was designed so as to obtain partial cross sections which are not dependent upon the asymmetry parameter β of the ejected photoelectrons. Partial cross sections are reported for individual vibrational states of the N 2 over the region covered by the Hopfield bands and their associated photoionization continua to 20.5 eV. Allowance has been made in the data for the resonant scattering of electrons from residual N 2 through the formation of the short-lived state of Ng and for the photo dissociation of . Partial cross sections for the electronic states of the ion are reported which allow recent theoretical predictions to be studied. Reasonable agreement is found between theory and experiment above 30 eV for the X 2 ∑ g + state of N 2 + . There is also good agreement between theory and experiment for the B 2 ∑ u + state except near threshold. The data for the A 2 II u state show a steady departure from theory towards the higher photon energies.