Mass spectrometric study of the photoionization of carbon disulphide in the wavelength interval 125–60 nm

Abstract

The ionization and dissociative ionization of CS₂ by photon impact have been investigated mass spectrometrically in the wavelength interval λ= 125–60 nm. The efficiency curves for formation of CS⁺₂, CS⁺, S⁺ and S⁺₂ are presented and discussed.

From the thresholds for formation of the fragment ions, values for the bond dissociation energy D°(S—CS, g, 0 K)= 432.1 ± 2.0 kJ mol^–1, the dissociation energy of CS, D°(CS, g, 0 K)= 712.1 ± 2.3 kJ mol^–1, the enthalpy of formation of CS, ΔH^o_f(CS, g, 0 K)= 273.9 ± 2.2 kJ mol^–1 and the ionization potential of S₂, i.p.(S₂)= 9.38 ± 0.03 eV are deduced and compared with literature values.