THE MILLIMETER - AND SUBMILLIMETER - WAVE SPECTRUM OF METHYL FORMATE $(HCOOCH_{3})$ AND SYMMETRIC MONODEUTERATED METHYL FORMATE $(DCOOCH_{3})$
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Date
1995
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Ohio State University
Abstract
Although deuterated isotopomers of organic molecules have been detected in various interstellar sources, singly deuterated isotopomers have not yet been detected in the interstellar medium due to a lack of laboratory spectroscopic data. To aid in the study of interstellar spectra, the analysis of the rotational-torsional spectrum of deuterated $methy^{l}$ formate has been extended into the millimeter-wave and submillimeter-wave regions of the electromagnetic spectrum. The A (symmetric) and E (asymmetric) torsional substates of the ground $(\nu_{t} = 0)$ torsional state of deuterated methyl formate have been fit to a rms deviation of 85 kHz using a direct digonalization procedure of an extended global internal -axis method (IAM) Hamiltonian. Using this global IAM approach, the A and E states of the ground torsional state for methyl formate have been reanalyzed and a rms deviation of less than 100 kHz has been obtained for the global fit of our data.
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Author Institution: The Ohio State University, 174 West 18th Avenue, Columbus, OH 43210.