# CRITICALLY EVALUATED MICROWAVE SPECTRA FOR LABORATORY AND ASTRONOMICAL STUDIES

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 Title: CRITICALLY EVALUATED MICROWAVE SPECTRA FOR LABORATORY AND ASTRONOMICAL STUDIES Creators: Lovas, F. J. Issue Date: 1978 Publisher: Ohio State University Abstract: The molecular spectra data center at the National Bureau of Standards is actively involved in developing critically evaluated microwave spectral data to aid both laboratory spectroscopists and radio astronomers. Two types of critical tables are being developed: a general compilation entitled Microwave Spectral Tables” which will replace the NBS Monograph 70, and specialised reviews on interstellar molecules. The second part of the Microwave Spectral Tables, which treats the spectra of triatomic molecules, has just been $completed^{1}$ A brief discussion of the information included for 54 triatomic species will be presented. The reanalysis of the $F_{2}O$ spectrum will be described to illustrate some of the difficulties encountered in evaluating literature data. A summary of the current status and plans for reviewing the spectra of known interstellar species will be presented. Highlights of several compilations currently in progress will be described. In particular, details concerning recent $laboratory^{2}$ and $interstellar^{3}$ measurements of dimethyl ether $(CH_{3}OCH_{3})$ will be given and a new compilation, Recommended Rest Frequencies for Observed Interstellar $Lines^{\prime\prime},^{4}$ will be described. Description: $^{1}$ F. J. Lovas, J. Phys. Chem. Ref. Data (submitted for publication, Sept., 1977). $^{2}$ F. J. Lovas, H, Dreizler and H. Lutz, manuscript in preparation, 1978. $^{3}$ F. O. Clark, F. J. Lovas and D. R. Johnson, manuscript in preparation, 1978. $^{4}$ F. J. Lovas, L. E. Snyder and D. R. Johnson, manuscript in preparation, 1978."" Author Institution: National Bureau of Standards URI: http://hdl.handle.net/1811/10722 Other Identifiers: 1978-WH-01