Linewidths and high resolution structure of the benzene 1B2u←1A1g two photon transition by multiphoton ionization–supersonic beam techniques

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Abstract
The two photon spectra of the 1B2u state of benzene‐h6 and benzene‐d6 have been examined in a supersonic molecular beam/multiphoton ionization experiment. The effect of channel three nonradiative decay on the resonance linewidths was followed through energies greater than 6000 cm−1 above the origin, 3000 cm−1 past the fluorescence cutoff region. The linewidth data suggest a leveling off of the channel three broadening at energies greater than T00+6000 cm−1. A new progression in the benzene‐h6 spectrum was revealed adjacent to the 1410 1n0 progression (n=1 to 5) which had previously been obscured in the rotational envelope of these bands. New structure and well resolved expected structure is seen in the benzene‐d6 spectrum as the 1410 1n0 progression is followed out to n=5.