Abstract
Recent spectroscopic work on the 3v3 band of SF6 has yielded two fundamental results important to our understanding of multiple photon absorption in SF6:(1) vibrational splittings are large and dominie the multiple photon spectrum at low temperature; (2) the molecular quasi-continuum lies above the 3v3 level in energy. The new picture of the discrete levels shows that multiple photon resonances persist up to at most ~10 photons within the v3 ladder, indicating that the molecular quasi-continuum is not needed to explain multiple photon absorption until high levels in the molecule are attained.
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