Abstract

Using a Nd:YAG pumped pulsed dye laser wavelength extender as UV light source, the multiphoton ionization or OCS was studied in a supersonic molecular beam with a Time of Flight mass spectrometer and a Magnetic Bottle Time of Flight photoelectron spectrometer. The intermediate resonant states of OCS were obtained from the mass selected MPI spectra by scanning the laser wavelength. From 2+1 MPI photoelectron spectra at different resonant wavelength the vibrational levels of OCS+ ion in electronic ground state X-2 Pi(3/2,1/2) were assigned d their X-2 Pi spin orbital splitting was determined to be 0.046eV. The us Franck-Condon behavior between the Rydberg intermediate state and the ionic state has been discussed.

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