1 B 2u↔1A1g spectroscopy of jet-cooled benzene: Single vibronic level fluorescence studies

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Abstract
As part of an investigation of intramolecular energy transfer in jet‐cooled 1B2u benzene, an extensive study of one photon 1B2u↔1A1g spectroscopy has been carried out. Our data lead to an assignment for ν8 in the 1B2u state (1516 cm−1), to a number of new assignments involving activity in ν18 and ν4, and they show that many of the higher vibrational levels in the 1B2u manifold are mixed. The activities of components of combination levels with different vibrational angular momenta have been observed and used to resolve several controversies concerning assignments in the 1B2u↔1A1g spectrum of benzene.