{"id":{"repo_id":"unlv","oai_identifier":"oai:oasis.library.unlv.edu:rtds-2221"},"canonical_url":"https://search.dev.ndltd.org/etd/unlv/oai:oasis.library.unlv.edu:rtds-2221","repository":{"repo_id":"unlv","name":"University of Nevada - Las Vegas","base_url":"https://oasis.library.unlv.edu/do/oai/"},"display":{"title":"Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules","abstract":"First hyperpolarizabilities beta of carbon tetrachloride, carbon tetrafluoride, deuterated methane, and methane have been measured by hyper-Rayleigh scattering in gas and liquid phases. The gas-phase results for the coefficient beta xyz (atomic units) are 11.0 +/- 0.9 (CC14), 5.4 +/- 0.4 (CF4), 7.0 +/- 0.6 (CD4), 7.1 +/- 0.7 (CH4). Ab initio calculations are consistent with the measured values for CCl4 and CF4. A discrepancy between theory and experiment remains for CH 4, and is likely due to higher-order vibrational effects not accounted for in calculations. While the effective, liquid-phase beta for CCl 4 is 200% higher than in the gas phase due to collective scattering modes, the liquid environment has little effect on beta for the other molecules. CD4 and CH4 liquids exhibit free-rotor behavior. Liquid-gas comparisons for CF4, CD4, and CH4 show evidence that the Lorentz local-field corrections are inadequate in nonlinear optics. Through z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules.","abstract_html":"First hyperpolarizabilities beta of carbon tetrachloride, carbon tetrafluoride, deuterated methane, and methane have been measured by hyper-Rayleigh scattering in gas and liquid phases. The gas-phase results for the coefficient beta xyz (atomic units) are 11.0 +/- 0.9 (CC14), 5.4 +/- 0.4 (CF4), 7.0 +/- 0.6 (CD4), 7.1 +/- 0.7 (CH4). Ab initio calculations are consistent with the measured values for CCl4 and CF4. A discrepancy between theory and experiment remains for CH 4, and is likely due to higher-order vibrational effects not accounted for in calculations. While the effective, liquid-phase beta for CCl 4 is 200% higher than in the gas phase due to collective scattering modes, the liquid environment has little effect on beta for the other molecules. CD4 and CH4 liquids exhibit free-rotor behavior. Liquid-gas comparisons for CF4, CD4, and CH4 show evidence that the Lorentz local-field corrections are inadequate in nonlinear optics. Through z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules.","abstract_has_math":false,"creators":["Pyatt, Robby D"],"institution":"University of Nevada, Las Vegas","degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["David Shelton"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2000,"date_issued":"2000-01-01T08:00:00Z","date_published":"2000-01-01T08:00:00Z","updated_at":"2026-07-24T05:25:18Z","subjects":[],"languages":["English"],"rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://oasis.library.unlv.edu/rtds/1222"],"render_values":[{"text":"https://oasis.library.unlv.edu/rtds/1222","href":"https://oasis.library.unlv.edu/rtds/1222","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.25669/1xq1-zbmg","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["David Shelton"]},{"key":"dc:creator","label":"Author","values":["Pyatt, Robby D"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["University of Nevada, Las Vegas"]},{"key":"dc:type","label":"Dc Type","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["10.25669/1xq1-zbmg","https://oasis.library.unlv.edu/rtds/1222","https://oasis.library.unlv.edu/context/rtds/article/2221/viewcontent/uc.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["First hyperpolarizabilities beta of carbon tetrachloride, carbon tetrafluoride, deuterated methane, and methane have been measured by hyper-Rayleigh scattering in gas and liquid phases. The gas-phase results for the coefficient beta xyz (atomic units) are 11.0 +/- 0.9 (CC14), 5.4 +/- 0.4 (CF4), 7.0 +/- 0.6 (CD4), 7.1 +/- 0.7 (CH4). Ab initio calculations are consistent with the measured values for CCl4 and CF4. A discrepancy between theory and experiment remains for CH 4, and is likely due to higher-order vibrational effects not accounted for in calculations. While the effective, liquid-phase beta for CCl 4 is 200% higher than in the gas phase due to collective scattering modes, the liquid environment has little effect on beta for the other molecules. CD4 and CH4 liquids exhibit free-rotor behavior. Liquid-gas comparisons for CF4, CD4, and CH4 show evidence that the Lorentz local-field corrections are inadequate in nonlinear optics. Through z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules."]},{"key":"dc:format","label":"Dc Format","values":["pdf"]},{"key":"dc:title","label":"Title","values":["Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules"]}]}],"canonical_facts":{"dc:contributor":["David Shelton"],"dc:creator":["Pyatt, Robby D"],"dc:description.abstract":["First hyperpolarizabilities beta of carbon tetrachloride, carbon tetrafluoride, deuterated methane, and methane have been measured by hyper-Rayleigh scattering in gas and liquid phases. The gas-phase results for the coefficient beta xyz (atomic units) are 11.0 +/- 0.9 (CC14), 5.4 +/- 0.4 (CF4), 7.0 +/- 0.6 (CD4), 7.1 +/- 0.7 (CH4). Ab initio calculations are consistent with the measured values for CCl4 and CF4. A discrepancy between theory and experiment remains for CH 4, and is likely due to higher-order vibrational effects not accounted for in calculations. While the effective, liquid-phase beta for CCl 4 is 200% higher than in the gas phase due to collective scattering modes, the liquid environment has little effect on beta for the other molecules. CD4 and CH4 liquids exhibit free-rotor behavior. Liquid-gas comparisons for CF4, CD4, and CH4 show evidence that the Lorentz local-field corrections are inadequate in nonlinear optics. Through z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules."],"dc:format":["pdf"],"dc:identifier":["10.25669/1xq1-zbmg","https://oasis.library.unlv.edu/rtds/1222","https://oasis.library.unlv.edu/context/rtds/article/2221/viewcontent/uc.pdf"],"dc:language":["English"],"dc:publisher":["University of Nevada, Las Vegas"],"dc:rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules"],"dc:type":["Text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T05:25:18Z"}