Abstract
The first mass-analyzed threshold ionization (MATI) spectra from molecular excited triplet states have been collected for benzene and perdeuteriobenzene from the 3B1u, lowest triplet state. From these spectra, the C6H6 3B1u state energy is found to be 29 627 ± 12 cm-1 and the C6D6 3B1u state energy is found to be 29 828 ± 12 cm-1. The MATI spectrum for each species was collected from 1000 cm-1 below the ionization threshold to ∼2000 cm-1 above the threshold. Hot band structure allowed for the first higher-resolution gas phase vibrational measurement of the ν1, ν8, and ν6 frequencies in the 3B1u state. They were found at 927, 229, and 575 cm-1 for the protonated molecule and at 832, 200, and 528 cm-1 for the deuterated molecule, respectively. New vibrational structure has also been observed in the cation ground state of both molecules.
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