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Millimeter and Submillimeter Spectra of Glycolaldehyde and Chlorine Nitrate

Butler, Rebecca Ann Harlan

Abstract Details

2002, Doctor of Philosophy, Ohio State University, Physics.

This work consists of spectroscopic measurements and analyses of the molecules glycolaldehyde and chlorine nitrate.

The glycolaldehyde analysis is of the ground state transitions. Lines were assigned in the 128 to 356 GHz region using data from the FASSST system for a total of 1082 transitions. These were fit with Pickett’s spfit programs, using 15 rotational and centrifugal distortion parameters, with an rms of 107 kHz. This analysis can be used to create predictions in the frequency range of the transitions that have been observed in the interstellar medium.

The rotational spectra of chlorine nitrate in a large number of vibrational states has been measured and analyzed. For the 35ClONO2 isotopomer, 4 fundamentals and 16 combination bands were analyzed, and for the 37ClONO2 isotopomer, 2 fundamentals and 9 combination bands were analyzed. The data was taken from 122-356 GHZ with the FASSST system, and from 78-118 GHz with a phase-lock synthesizer.

Special emphasis was placed on the chlorine nitrate states that had observable vibrational interactions: the 2ν97 dyad, the 3ν97ν9 dyad, the 4ν979/2ν7 triad, the 5ν979/2ν7ν9 triad, and the ν6ν95 dyad. The nν9/mν7 family had very similar perturbations, as each interacting pair or trio had the same symmetry and therefore had both anharmonic and c-type coriolis interactions. The ν6ν9 and ν5 states, however, had different symmetry and had only b-type coriolis interactions.

All together over 20,000 lines have been assigned for chlorine nitrate. The complete list of states analyzed for 35ClONO2, in order of ascending energy, is: 2ν9, ν7, 3ν9, ν7ν9, ν6, 4ν9, ν79, 2ν7, ν6ν9, ν5, 5ν9, ν79, 2ν 7 ν9, ν69, ν6ν7, 6ν9, ν79, ν4, ν69, and 7ν9. The list for 37ClONO2 cuts off at ν79.

This study is the first extensive demonstration of analyses of previously unknown rotational structures in excited vibrational states. These studies are becoming possible due to the constantly improving sensitivity and spectral coverage of millimeter and sub-millimeter techniques, and becoming realistic to do with the increased speed of systems such as the FASSST spectrometer. The methods described in this work can be employed for similar studies of dense spectra of heavy molecules.

Frank De Lucia (Advisor)
171 p.

Recommended Citations

Citations

  • Butler, R. A. H. (2002). Millimeter and Submillimeter Spectra of Glycolaldehyde and Chlorine Nitrate [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1029959415

    APA Style (7th edition)

  • Butler, Rebecca. Millimeter and Submillimeter Spectra of Glycolaldehyde and Chlorine Nitrate. 2002. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1029959415.

    MLA Style (8th edition)

  • Butler, Rebecca. "Millimeter and Submillimeter Spectra of Glycolaldehyde and Chlorine Nitrate." Doctoral dissertation, Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1029959415

    Chicago Manual of Style (17th edition)