Chlorine L absorption cross sections of gaseous HCl and Cl2

Abstract

The Cl L photoabsorption cross sections HCl and Cl₂ were obtained with high resolution over a range between 198 and 280 eV. Below the Cl L_2,3 ionisation thresholds, two broad bands and the sharp Rydberg series were observed for both molecules. These structures were assigned with the aid of ab initio calculations. Furthermore, two broad bands were observed above the Cl L_2,3 ionisation thresholds for Cl₂, while a single broad band was observed for HCl.