Near-infrared fourier-transform planar supersonic-jet spectroscopic studies of weakly bound neutral molecular complexes /
A supersonic-jet FTIR spectrometer system has been developed and applied to the rovibrational analysis of hydrogen bonded and van der Waals complexes. This system has the unique advantage of providing broadband frequency coverage, operating in the region of 10 - 10,000 cm-', for direct absorpt...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Summary: | A supersonic-jet FTIR spectrometer system has been developed and applied to the rovibrational analysis of hydrogen bonded and van der Waals complexes. This system has the unique advantage of providing broadband frequency coverage, operating in the region of 10 - 10,000 cm-', for direct absorption studies of weakly bound dimer and trimer species. The sensitivity of the current spectrometer is conservatively estimated to be -6 x 108 molecules/cc/state based on a single pass of the interferometer's optical beam through the supersonic jet expansion. Using FTIR spectroscopy we are able to record high resolution spectra in the entire mid-infrared region just by the simple re-configuration of the spectrophotometer components, i.e., by exchanges of IR source, detector and beamsplitter combinations. To demonstrate the advantage of this experimental method, rovibrational studies of the vi and V2 bands of OC--HCI, and the v, bands of both Ar--HCI, and N2--HCI are presented. In all of these cases, spectra were observed and analyzed for both the 35Cl and 37Cl isomeric forms of these complexes. Also, in a study of HCI aggregation in a supersonic jet free expansion, spectra were observed for the vi ︢and v2 ︢bands of HCI dimer. The v5 spectrum of (HCI)3 was also observed and was surprisingly comparable in intensity to HCI dimer spectra. (HCI)4 was observed as well, but due to the lack of any observable rotational structure it is believed that the complex predissociates upon rovibrational excitation. Finally, the v2 Ka,, = 0-0 rovibrational sub-band involving the HCI stretching vibration was analyzed for HF--HCI dimer complex. Spectra were observed for both the 35Cl and 37Cl isomeric forms of these complexes. |
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| Item Description: | Vita. "Major Subject: Chemistry". |
| Physical Description: | xi, 99 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |