MILLIMETER WAVE SPECTRA AND CENTRIFUGAL STRETCHING CONSTANTS OF THE METHYL $HALIDES^{*}$
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Date
1954
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The extension of the workable millimeter wave region1 has made possible measurements of high J transitions in the methyl halides, where centrifugal distortion displacements of rotational lines amount to many megacycles. High J transitions of these substances have been measured for a more accurate evaluation of the distortion constants. The new $D_{J}$ value for $CH_{3}Cl^{35}, 18.1 \pm 0.5$ Kc, is in good agreement with the value 18.4 Mc, theoretically predicted by Chang and $Dennison.^{2}$ Earlier $measurements^{3}$ on lower J transitions gave $D_{JJ} = 26.4$ Kc, while recent infrared measurements gave an estimated $D_{JJ} = 24 Kc.^{4}$
Description
$^{*}$Supported by a contract with the United States Air Force. $^{**}$Visiting Fulbright Scholar, 1953-54. On Sabbatical leave from Edward Davies Chemical Laboratories, University College of Wales, ABERYSTWYTH. $^{1}$ W. C. King and W. Gordy, Phys. Rev. 90:319 (1953) $^{2}$ Tsu-Shen Chang and D. M. Dennison, J. Chem. Phys. 21:1293 (1953) $^{3}$ J. W. Simmons and W. E. Anderson, Phys. Rev. 80:338 (1950) $^{4}$J. Pickworth and H. W. Thompson, Trans. Faraday Soc. 50:218, (1954)
Author Institution: Department of Physics, Duke University
Author Institution: Department of Physics, Duke University