The Electric Dipole and the Nuclear Quadrupole Moment of Methyl Bromide in the Ground Vibrational State

✍ Scribed by S. Carocci; P. Minguzzi; M. Tonelli; A. Dilieto

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 650 KB
• Volume: 160
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1993.1183

✦ Synopsis

A set of high-resolution Stark measurements at millimeter-wave frequencies is reported for (\mathrm{CH}{3}{ }^{79} \mathrm{Br}) and (\mathrm{CH}{3}{ }^{81} \mathrm{Br}). These results are analyzed together with previous data available in the literature to find new sets of molecular (rotational, hyperfine, and dipole moments) constants for both isotopic species. A particular improvement is obtained in the evaluation of the dipole moments, whose values are (\mu(79)=1.82171) (26) D, (\mu(81)=1.82185) (26) D, and for the hyperfine-structure parameters, which are estimated by assuming the most recent model for centrifugal distortion (M. R. Aliev and J. T. Hougen. J. Mol. Spectrosc. 106, 110-123 (1984)), obtaining (e q Q_{0}^{79}=577.1088(57) \mathrm{MHz}, \chi_{j}^{79}=-0.63(16) \mathrm{kHz}, \chi_{K}^{79}=12.6(16) \mathrm{kHz}) and (e q Q_{0}^{81}=482.1030(94) \mathrm{MHz}, \chi_{J}^{81}=-0.57) (17) (\mathrm{kHz}, \chi_{K}^{81}=9.3) (22) kHz. cs 1993 Academic Press, inc.