On the photoelectron spectrum of Cs2

High-resolution photoelectron spectra of CS2 have been obtained by photoionization with the He(I) (58.4 nm), Ne(I) (73.58-74.37 nm) and Ar(I) (104.8-106.7 nm) resonance lines. The resolution of about 17 meV was further improved by deconvolution of the experimental data. The formation of the X tilde2 PIsub(g) and B tilde2Σ+sub(u) states is accompanied by a weak ν2 excitation. The spin-orbit splitting of the A tilde2PIsub(u) state is completely resolved, and a value of 186 cm-1 is reported. We confirm the value of 12.689 eV for the ionization threshold of the A tilde2PIsub(u3/2) state, and show that the small peak observed at lower energy is due to a hot band. (orig.)