Abstract
We present absorption spectra of the rotational band contours of the 610 and 710 bands in benzene, 12C6H6 and 13C12C5H6. These spectra were measured using resonant two-photon ionization in combination with time of flight mass spectrometry. A rotational temperature of 2.0 K was obtained by coexpanding the benzene in a supersonic jet of argon. We have resolved different J levels in the 610 band. Contours of the bands are simulated using a rigid-rotor model and accounting for Coriolis splitting. For the isotopomer, the vibrational modes 6 and 7 each consist of two nondegenerate modes a and b and the positions of these band origins relative to the band origin of the twofold degenerate state of benzene have been determined. The splitting between bands of mode 6 is in good agreement with values reported in literature which were calculated with force field methods for the ground state. The splitting in band 7 is dominated by either a difference in anharmonicity or a shift due to a Fermi resonance.
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