Fourier transform microwave spectroscopy of weakly bound complexes, multiconformational molecules, and interstellar radicals

Details Fourier transform microwave spectroscopy of weakly bound complexes, multiconformational molecules, and interstellar radicals Fourier transform microwave spectroscopy of weakly bound complexes, multiconformational molecules, and interstellar radicals

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........36m&link_type=abstract

Thesis (PhD). WESLEYAN UNIVERSITY, Source DAI-B 60/06, p. 2720, Dec 1999, 240 pages.

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Using a Fourier Transform Microwave (FTMW) spectrometer structural information has been gained on several different types of molecular systems: van der Waals complexes, multi-conformational molecules, interstellar radicals and related species. This thesis is divided into four sections summarizing the results of this research. Section I contains information on the theory of molecular rotations and the current experimental set-up of the spectrometer. Included are recent machine upgrades and experiments that determine the amount of increase in sensitivity achieved as a result of these upgrades. In addition, molecular beam number density calculations are presented in this chapter, followed by an abbreviated user's manual. Section II contains a chapter on the argon-Cyclobutanone van der Waals complex. The spectra of the normal 12C complex as well as three 13C isotopomers have been observed and the dipole moment of the major isotopomer has been determined. A wide amplitude motion across the C 2 axis and perpendicular to the plane of the ring was also found. Section III contains two papers: one on the NF3 monomer and one on gauche perfluoro- n-butane and iso-perfluorobutane. Hyperfine components were observed for the nitrogen quadrupole as well as for the fluorine spins. The spectrum of the gauche perfluoro-n- butane molecule was observed and assigned. The normal 12C isotopomer as well as two 13C isotopomers were observed in natural abundance for the iso-perfluorobutane monomer and the dipole moment of the major isotopomer was measured. Section IV contains two chapters: one on the cyanopropynyl radical and the other on a series of methylcyanopolyyne molecules. Complex hyperfine components were typical of the microwave spectrum in all cases. The molecules presented in these chapters are excellent candidates for detection in the interstellar medium, specifically in the cold molecular cloud TMC-1. Finally, recent studies on vibrationally excited species are presented in the Appendix as well as a new molecule which spectra has been assigned but the identity of the species is still unknown. All work presented in this section of the thesis is still preliminary and included as a means for future study.

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