High resolution spectroscopy of open shell clusters
<p>The microwave spectrum of the open-shell van der Waals complex NO-HF has been recorded in the region 6-20GHz using a pulsed nozzle Fourier transform microwave spectrometer. This is the first observation of the microwave spectrum of a open-shell van der Waals complex between two molecules....
| Hlavní autoři: | , |
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| Médium: | Diplomová práce |
| Jazyk: | English |
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1997
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| _version_ | 1826316482091417600 |
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| author | Dennis, C C. R. Dennis |
| author2 | Howard, B |
| author_facet | Howard, B Dennis, C C. R. Dennis |
| author_sort | Dennis, C |
| collection | OXFORD |
| description | <p>The microwave spectrum of the open-shell van der Waals complex NO-HF has been recorded in the region 6-20GHz using a pulsed nozzle Fourier transform microwave spectrometer. This is the first observation of the microwave spectrum of a open-shell van der Waals complex between two molecules. The spectrum exhibits a rich hyperfine structure with the observation of intermolecular hyperfine interactions in an isolated system providing a sensitive probe of electron transfer in the complex.</p><p>The spectrum consists of four fine structure transitions 5/2(e)-3/2(e), 3/2(e)-1/2(e), 5/2(f)-3/2(f), 3/2(f)-1/2(f) which have been fitted to a semi-rigid Hamiltonian developed to include the effects of the orbital and spin angular momenta of the unpaired electron on NO. A new treatment to account for the intermolecular hyperfine interaction was developed. The structure of the complex has been determined and is significantly bent with an angle of between 37 degrees and 49 degrees between the NO internuclear axis and the a-axis of the complex. The Renner-Teller parameter, epsilon 2, is very large and negative having the value of -10 449.32(4)GHz indicating that configuration with the unpaired electron in the plane of the complex is more stable.</p><p>The analysis of the hyperfine interactions of the hydrogen and fluorine nuclei uses two constants for each nucleus, one for the spatial relationship between the magnetic moments of the unpaired electron and the nuclear magnetic moment and a Fermi-contact term.</p><p>The Fermi-contact term for hydrogen is the first strong evidence of intermolecular charge transfer in an isolated van der Waals molecule.</p> |
| first_indexed | 2024-03-06T21:27:48Z |
| format | Thesis |
| id | oxford-uuid:43ac8ad5-724a-4a23-a03f-3eb78e6f4e72 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:45:53Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:43ac8ad5-724a-4a23-a03f-3eb78e6f4e722024-12-07T17:48:54ZHigh resolution spectroscopy of open shell clustersThesishttp://purl.org/coar/resource_type/c_db06uuid:43ac8ad5-724a-4a23-a03f-3eb78e6f4e72Spectroscopy and molecular structurePhysical & theoretical chemistryEnglishOxford University Research Archive - Valet1997Dennis, CC. R. DennisHoward, B<p>The microwave spectrum of the open-shell van der Waals complex NO-HF has been recorded in the region 6-20GHz using a pulsed nozzle Fourier transform microwave spectrometer. This is the first observation of the microwave spectrum of a open-shell van der Waals complex between two molecules. The spectrum exhibits a rich hyperfine structure with the observation of intermolecular hyperfine interactions in an isolated system providing a sensitive probe of electron transfer in the complex.</p><p>The spectrum consists of four fine structure transitions 5/2(e)-3/2(e), 3/2(e)-1/2(e), 5/2(f)-3/2(f), 3/2(f)-1/2(f) which have been fitted to a semi-rigid Hamiltonian developed to include the effects of the orbital and spin angular momenta of the unpaired electron on NO. A new treatment to account for the intermolecular hyperfine interaction was developed. The structure of the complex has been determined and is significantly bent with an angle of between 37 degrees and 49 degrees between the NO internuclear axis and the a-axis of the complex. The Renner-Teller parameter, epsilon 2, is very large and negative having the value of -10 449.32(4)GHz indicating that configuration with the unpaired electron in the plane of the complex is more stable.</p><p>The analysis of the hyperfine interactions of the hydrogen and fluorine nuclei uses two constants for each nucleus, one for the spatial relationship between the magnetic moments of the unpaired electron and the nuclear magnetic moment and a Fermi-contact term.</p><p>The Fermi-contact term for hydrogen is the first strong evidence of intermolecular charge transfer in an isolated van der Waals molecule.</p> |
| spellingShingle | Spectroscopy and molecular structure Physical & theoretical chemistry Dennis, C C. R. Dennis High resolution spectroscopy of open shell clusters |
| title | High resolution spectroscopy of open shell clusters |
| title_full | High resolution spectroscopy of open shell clusters |
| title_fullStr | High resolution spectroscopy of open shell clusters |
| title_full_unstemmed | High resolution spectroscopy of open shell clusters |
| title_short | High resolution spectroscopy of open shell clusters |
| title_sort | high resolution spectroscopy of open shell clusters |
| topic | Spectroscopy and molecular structure Physical & theoretical chemistry |
| work_keys_str_mv | AT dennisc highresolutionspectroscopyofopenshellclusters AT crdennis highresolutionspectroscopyofopenshellclusters |