Photoelectron Spectroscopy of HCl and DCl Using Molecular Beams

Abstract

A focusing field electrostatic energy analyzer was used to examine photoelectrons from HCl and DCl using the 584 Å line of helium and the 736–744‐Å doublet of neon. Ionization potentials for the $X^2{\Pi }_i$ and $A^2{\Sigma }^{+}$ states of HCl⁺ and DCl⁺ were determined and found to be essentially in agreement with values obtained by spectroscopic methods. Relative transition probabilities to the molecular–ion states were measured and are in agreement with calculated values.