The1B2ularr;larr;1Algtwohyphen;photon spectra of several isotopes of benzene by supersonic beamndash;multiphoton ionization spectroscopy

摘要

The twohyphen;phonon spectra of the1B2ularr;larr;1Algtransitions of benzene, perdeuterobenzene, symhyphen;C6H3D3,phyphen;C6H4D2, and C6H5D have been recorded in a supersonic beamndash;multiphoton ionization experiment. A thorough assignment of these spectra includes a number of new bands as well as some reassignments of features seen in previous room temperature studies, notably in transitions concerning the ngr;12vibration. Efficient rotational cooling has allowed the direct measurement of rotationless band origins with better than 0.5 cmminus;1accuracy, uncovering structure due to naturally occurring13C substituted molecules and to dimers created in the expansion.