# ELECTRIC DIPOLE MOMENTS AND $^{14}N$ NUCLEAR QUADRUPOLE HYPERFINE STRUCTURE OF TWO CONFORMERS OF GLYCINE

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 Title: ELECTRIC DIPOLE MOMENTS AND $^{14}N$ NUCLEAR QUADRUPOLE HYPERFINE STRUCTURE OF TWO CONFORMERS OF GLYCINE Creators: Grabow, Jens-Uwe; Suenram, R. D.; Lovas, F. J.; Kawashima, Y.; Fraser, G. T.; Hirota, Eizi Issue Date: 1995 Publisher: Ohio State University Abstract: The mm-wave spectra for two conformations of glycine have been reported previously. Following the initial laboratory study of $conformer II^{1,2}$ laboratory spectra of conformation $I^{3}$ have been observed. With the aid of theoretical $studies^{4}$ conformer I has been determined to be the lowest energy form. During recent years a number of interstellar searches for glycine have been based on these initial studies. In the present work we report new laboratory studies of conformer I and II at cm-wave lenghts. The measurements were made with a pulsed supersonic-jet. Fourier-Transform microwave Fabry Perot-resonator spectrometer, equipped with a heated nozzle or laser-ablation nozzle for the vaporization of the solid-phase glycine. A number of low-J rotational transitions of the normal species, both mono $-^{13}C$ species, $^{15}N$ species and the $CD_{2}$ species of conformers I and II have been measured, with the $^{14}N$ nuclear quadrupole hyperfine structure resolved. In addition to the rotational and centrifugal distortion analysis we have determined the $^{14}N$ nuclear quadrupole coupling tensor and the electric dipole moments. Description: 1. R. D. Suenram and F. J. Lovas, J. Mol. Spectrosc 72, 372 (1978). 2. R. D. Brown, P. D. Godfrey, J. W. Storey, and M. P. Bassez, J. Am. Chem. Soc., Chem Comm. 547 (1978). 3. R. D. Suenram and F. J. Lovas, J. Am. Chem. Soc 99, 7180 (1980). 4. L. Schaefer, H. L. Sellers, F. J. Lovas, and R. D. Suenram. J. Am. Chem. Soc 102, 6566 (1980). Author Institution: National Institute of Standards and Technology, Gaithersburg MD 20899, USA.; Kanagawa Institute of Technology, 130 Shimo-Ogino, Atsugi-shi, Kanagawa-ken, 243-02, Japan.; The Graduate University for Advanced Studies, 4259 Nagatsuta, Midori-ku, Yokohnama 227, Japan. URI: http://hdl.handle.net/1811/29682 Other Identifiers: 1995-RI-12