Chan, Man-Chor and Lee, Szetsen S. and Okumura, Mitchio and Oka, Takeshi (1991) Laser spectroscopic studies of the pure rotational U0(0) and W0(0) transitions of solid parahydrogen. Journal of Chemical Physics, 95 (1). pp. 88-97. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:CHAjcp91
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High resolution spectrum of multipole-induced transitions of solid parahydrogen was recorded using diode and difference frequency laser spectroscopy. The J=4<--0 pure rotational U0(0) transition observed in the diode spectrum agrees well in frequency with the value reported by Balasubramanian et al. [Phys. Rev. Lett. 47, 1277 (1981)] but we observed a spectral width smaller by about a factor of 4. The J=6<--0 W0(0) transition was observed to be exceedingly sharp, with a width of ~70 MHz, using a difference frequency spectrometer with tone-burst modulation. This transition is composed of three components with varying relative intensity depending upon the direction of polarization of laser radiation. These components were interpreted as the splitting of the M levels in the J=6 state due to crystal field interactions. In addition, a new broad feature was found at 2452.4 cm^−1 in the low resolution Fourier-transform infrared (FTIR) spectrum of solid hydrogen and was assigned to be the phonon branch WR(0) transition of the W0(0) line. The selection rules, crystal field splitting of J=4 and J=6 rotons, and the measured linewidth based on these observations are discussed.
|Additional Information:||Copyright © 1991 American Institute of Physics. Received 8 March 1991; accepted 28 March 1991. We would like to thank M.-F. Jagod, B.D. Rehfuss, L.-W. Xu, C.M. Gabrys, and M. Rösslein for their assistance. This work was supported by the U.S. Air Force Contract No. F04611-86-K-0069 and the University of Dayton Research Center Award no. RI-68741X1F333615-87-C-2714. M.C.C. acknowledges a graduate scholarship from the United College, the Chinese University of Hong Kong.|
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