Abstract
In a series of third harmonic generation experiments, we are able to probe the excitation of SF 6 molecules through the discrete states below 3000 cm-1. The nonlinear susceptibility of SF 6 is strongly affected by multiphoton resonances and by population redistribution and depletion. The third harmonic generation spectrum for SF 6 was measured for intensities above and below the molecular dissociation threshold. Experimental evidence indicates the presence of several resonant multiphoton transitions in the discrete states and one and two-photon transitions from discrete states to the quasi-continuum, depending on the frequency of laser excitation.
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