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Ohio State University

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The millimeter wave spectrum of glycine ($NH_{2} CH_{2} COOH$) the simplest amino acid has been observed and $analyzed.^{1}$ The a-type transitions have been fit to a centrifugal distortion model for both the ground and first excited virbrational state. The spectral data are consistent with the compact conformation as the source of the observed spectrum. This conformer involves a hydrogen bond between the lone pair of electrons of the amino group and the hydrogen atom of the hydroxyl group. These results are in agreement with the lower frequency study by Brown et. $al.^{2}$ According to a recent geometry optimized ab initio $calculation^{3}$, the conformer assigned may not be the lowest energy conformer. In order to access the validity of the geometry optimized ab-initio results, isotopic species of glycine are being studied to determine the structure of the assigned conformer. Searches for a second conformer based on spectral predictions from the ab-initio study are also in progress and will be discussed. Finally, the results of a collaborative $effort^{4}$ concerning the initial interstellar searches for the glycine conformer which has been assigned will be presented.


$^{1}$ R. D. Suenram and F. J. Lovas, J. Mol. Spectrosc. 72, 372 (1978). $^{2}$ R. D. Brown, P. D. Godfrey, J. W. V. Storey and M. -P. Bassez, J. C. S. Chem. Comm., 547, (1978). $^{3}$ H. L. Sellers and L. Schafer, J. Am. Chem. Soc. 100, 7728 (1978). $^{4}$ L. E. Snyder, J. M. Hollis, L. W. Brown, D. Buhl, R. D. Suenram and F. J. Lovas, work in progress.
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