MILLIMETER AND SUBMILLIMETER SPECTROSCOPY OF SMALL INTERNAL ROTORS
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Date
1987
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Publisher
Ohio State University
Abstract
Small internal rotor molecules play important roles in the millimeter-wave spectra of both interstellar sources and our atmosphere. Indeed, the rotational-torsional spectra of such species are important indicators of the process of star formation in interstellar clouds. In recent years, the Duke Microwave Laboratory has embarked on a study of the rotational-torsional spectra of a variety of fundamental internal rotor species at frequencies up to 1 THz. In this study, both our standard klystron-based spectrometer and a novel broad-band spectrometer have been utilized. Analysis of the data has necessitated improvements to the classical IAM and PAM techniques used to interpret the spectra of internal rotors. In this talk, recent work on the methanol isotopes $^{13}CH_{3}OH$ and $CH_{3}OD$ will be discussed. The work on $13CH3OH$ has resulted in the assignment of a number of previously unidentified interstellar lines. In addition, work in progress on several torsional states of $(CH_{3})2O$ and of $HNO_{3} (v_{9} = 1)$ will be mentioned.
Description
Author Institution: Department of Physics, Duke University