# REINVESTIGATION OF THE MICROWAVE SPECTRUM OF ACETAMIDE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/20102

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 Title: REINVESTIGATION OF THE MICROWAVE SPECTRUM OF ACETAMIDE Creators: Suenram, R. D.; Golubiatnikov, G. Yu.; Leonov, Igor I.; Hougen, Jon T.; Fraser, G. T.; Kleiner, I.; Ortigoso, J. Issue Date: 2001 Publisher: Ohio State University Abstract: About 50 jet-cooled Fourier transform lines for acetamide have been recorded using a new version of our spectrometer, which has been upgraded with a heated nozzle and an expanded automatic scanning range. Nuclear quadrupole hyperfine structure arising from the nitrogen atom was removed theoretically to yield hyperfine-free center frequencies. In addition, about 30 submillimeter measurements were carried out. When hyperfine structure was observed for these lines, it was also removed theoretically. A set of 115 A-species and E-species rotational transitions in the torsional ground state, obtained by combining our new measurements with the literature data, have been fit to a model involving 28 torsion, rotation, and torsion-rotation interaction parameters to near experimental uncertainty (i.e., to a weighted unitless standard deviation of 1.5), significantly improving on previous fits. Various theoretical problems associated with K labels for E-species levels arise in this very low barrier molecule, requiring a variant of the signed $K_{a}$ labels frequently used for internal-rotor E states. Description: Author Institution: National Institute of Standards and Technology; Optical Technology Division, National Institute of Standards and Technology; Optical Technology Division, Universit\""e Paris-Sud; Laboratoire de Photophysique Mol\'eculaire, Instituto de Estructura de la Materia URI: http://hdl.handle.net/1811/20102 Other Identifiers: 2001-RB-09