MASS-SPECTROMETRIC STUDY OF THE PHOTOIONIZATION OF CS - THE DISSOCIATION-ENERGY OF THE CS MOLECULE

A mass spectrometric study of the photoionization of CS provides 11.319 +/- 0.006 eV for the ionization potential, in agreement with literature values. Three Rydberg series converging to the C-2 Sigma(+) State of the molecular ion are identified. Their limit is 18.003 +/- 0.006 eV. The threshold for dissociative ionization of CS towards S+ is located at 70.05 +/- 0.1 nm and yields D-0(CS, 0 K)= 709.4 +/- 2.5 kJ/mol. This result is briefly compared with prior data. D-0(CS, 0 K)= 709.6 +/- 1.2 kJ/mol and D-0(CS+, 0 K)= 617.1 +/- 1.3 kJ/mol are selected as the best estimates for these quantities.