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We report the rotationally resolved spectra of C6H5D obtained in a supersonic seeded jet by Doppler free UV laser spectroscopy with an effective resolution of about 0·0045 cm-1. The coupled 6a1 0 and 6b1 0 vibronic transitions are analysed in terms of their spectroscopic constants ( = 38 634·2429 cm-1 for 6a1 0 and = 38 637·1792 cm-1 for 6b1 0) and the Coriolis coupling constant ξc 6 = 0·095 85 cm-1, obtained by constraining the C rotational constants to be equal for 6a1 and 6b1. Simulations of the spectra result in rotational temperatures of about 2K. The polarizations of the two transitions could be determined unambiguously as well as the approximate ratio of the transition moments.
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Riedle et al. (1994) studied this question.
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