An experimental investigation of the nf Rydberg states of carbon disulfide

The (2Πg3/2,1/2)nf Rydberg states of CS2 are investigated by means of (3+1) resonance enhanced multiphoton ionization (REMPI) time-of-flight (TOF) spectroscopy. The excitation spectrum of jet-cooled carbon disulfide has been obtained in the 74 000–81 000 cm−1 energy region. From the CS2+ mass selected REMPI spectra, the nf Rydberg series have been clearly identified and they have been found converging to the two spin–orbit components of the CS2+ (X 2Πg) ground state corresponding to the n=4–11 members. Comparison of the CS2+, CS+, S+ mass selected REMPI spectra gave a better insight of the competition between dissociation and ionization processes. The use of linearly and circularly polarized laser light, selection rules and quantum defect considerations have led to a preliminary analysis of the measured nf complexes.