A MULTIPHOTON POLARIZATION STUDY OF THE RYDBERG STATES OF OCS IN THE 70500-74500 CM(-1) ENERGY REGION

The polarization dependence of the (2 + 1) and (3 + 1) resonance enhan ced multiphoton ionization of OCS have been investigated in the 70 500 -74 500 cm(-1) energy region. This region contains a complex system of bands arising from the excitation of the 4p Rydberg states. The symme try of most of the observed bands have been unambiguously determined b ased on the intensity changes of the two and three photon resonant spe ctra using both linearly and circularly polarized light. These results generally confirm the assignments suggested in a previous study. New bands have also been observed and some new assignments are proposed. T he vibrational frequencies v(1), v(2), and v(3) of the Rydberg states in that energy region are determined. (C) 1996 American Institute of P hysics.