# MILLIMETER WAVE SPECTRA AND CENTRIFUGAL STRETCHING CONSTANTS OF THE METHYL $HALIDES^{*}$

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 Title: MILLIMETER WAVE SPECTRA AND CENTRIFUGAL STRETCHING CONSTANTS OF THE METHYL $HALIDES^{*}$ Creators: Orville-Thomas, W. J.; Cox, J. T.; Gordy, Walter Issue Date: 1954 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 URI: http://hdl.handle.net/1811/7268 Other Identifiers: 1954-H-6