Far infrared absorption by pairs of nonpolar molecules
Identifieur interne : 001746 ( Istex/Corpus ); précédent : 001745; suivant : 001747Far infrared absorption by pairs of nonpolar molecules
Auteurs : Aleksandra Borysow ; Lothar Frommhold ; P. DoreSource :
- International Journal of Infrared and Millimeter Waves [ 0195-9271 ] ; 1987-04-01.
English descriptors
Abstract
Abstract: Recent progress in the field of binary collision induced spectra of nonpolar gases and mixtures in the far infrared (FIR) region of the spectrum includes accurate measurements of a variety of molecular systems and temperatures, and rigorous quantum calculations. The latter are based on the isotropic potential approximation and either on ab initio induced dipole data obtained with highly correlated wavefunctions, or on the classical multipole induction model. The contributions of both free pairs of molecules in collisional interaction, and bound pairs (van der Waals molecules), are accounted for in equilibrium proportions. The effects of the anisotropy of the intermolecular interaction potential on the spectra are also being understood in quantitative terms. On an absolute intensity scale, the agreement of theory with the laboratory measurements is typically well within the uncertainties of the measurements if all theoretical dimer features are flattened by convolution with with an instrumental profile of 10 or 20 cm−1 width; certain dimer features have been seen in the FIR spectra of the atmospheres of the outer planets and their big moons. For astrophysical and other applications, the results of the quantum computations have been cast into simple analytical expressions which reproduce collision induced spectra accurately as function of frequency and temperature on computers of small capacity in seconds for a selection of molecular systems.
Url:
DOI: 10.1007/BF01010737
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ISTEX:DCC7E9ED1F60AD29DA05A79E1503D18FE7E7F560Le document en format XML
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The latter are based on the isotropic potential approximation and either on ab initio induced dipole data obtained with highly correlated wavefunctions, or on the classical multipole induction model. The contributions of both free pairs of molecules in collisional interaction, and bound pairs (van der Waals molecules), are accounted for in equilibrium proportions. The effects of the anisotropy of the intermolecular interaction potential on the spectra are also being understood in quantitative terms. On an absolute intensity scale, the agreement of theory with the laboratory measurements is typically well within the uncertainties of the measurements if all theoretical dimer features are flattened by convolution with with an instrumental profile of 10 or 20 cm−1 width; certain dimer features have been seen in the FIR spectra of the atmospheres of the outer planets and their big moons. For astrophysical and other applications, the results of the quantum computations have been cast into simple analytical expressions which reproduce collision induced spectra accurately as function of frequency and temperature on computers of small capacity in seconds for a selection of molecular systems.</div></front></TEI><istex><corpusName>springer-journals</corpusName><author><json:item><name>Aleksandra Borysow</name><affiliations><json:string>Physics Department, University of Texas, 78712-1081, Austin, Tx.</json:string><json:string>Physics Department, University of Rome, 00185, Rome, Italy</json:string></affiliations></json:item><json:item><name>Lothar Frommhold</name><affiliations><json:string>Physics Department, University of Texas, 78712-1081, Austin, Tx.</json:string><json:string>Physics Department, University of Rome, 00185, Rome, Italy</json:string></affiliations></json:item><json:item><name>P. 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AffiliationIDS="Aff1 Aff2"><AuthorName DisplayOrder="Western"><GivenName>Aleksandra</GivenName><FamilyName>Borysow</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff1 Aff2"><AuthorName DisplayOrder="Western"><GivenName>Lothar</GivenName><FamilyName>Frommhold</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>P.</GivenName><FamilyName>Dore</FamilyName></AuthorName></Author><Affiliation ID="Aff1"><OrgDivision>Physics Department</OrgDivision><OrgName>University of Texas</OrgName><OrgAddress><Postcode>78712-1081</Postcode><City>Austin</City><State>Tx.</State></OrgAddress></Affiliation><Affiliation ID="Aff2"><OrgDivision>Physics Department</OrgDivision><OrgName>University of Rome</OrgName><OrgAddress><Postcode>00185</Postcode><City>Rome</City><Country>Italy</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Abstract</Heading><Para>Recent progress in the field of binary collision induced spectra of nonpolar gases and mixtures in the far infrared (FIR) region of the spectrum includes accurate measurements of a variety of molecular systems and temperatures, and rigorous quantum calculations. The latter are based on the isotropic potential approximation and either on ab initio induced dipole data obtained with highly correlated wavefunctions, or on the classical multipole induction model. The contributions of both free pairs of molecules in collisional interaction, and bound pairs (van der Waals molecules), are accounted for in equilibrium proportions. The effects of the anisotropy of the intermolecular interaction potential on the spectra are also being understood in quantitative terms. On an absolute intensity scale, the agreement of theory with the laboratory measurements is typically well within the uncertainties of the measurements if all theoretical dimer features are flattened by convolution with with an instrumental profile of 10 or 20 cm<Superscript>−1</Superscript> width; certain dimer features have been seen in the FIR spectra of the atmospheres of the outer planets and their big moons. For astrophysical and other applications, the results of the quantum computations have been cast into simple analytical expressions which reproduce collision induced spectra accurately as function of frequency and temperature on computers of small capacity in seconds for a selection of molecular systems.</Para></Abstract><KeywordGroup Language="En"><Heading>Key Words</Heading><Keyword>collision-induction</Keyword><Keyword>far infrared and microwave absorption</Keyword><Keyword>supermolecular spectra</Keyword></KeywordGroup></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Far infrared absorption by pairs of nonpolar molecules</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Far infrared absorption by pairs of nonpolar molecules</title></titleInfo><name type="personal"><namePart type="given">Aleksandra</namePart><namePart type="family">Borysow</namePart><affiliation>Physics Department, University of Texas, 78712-1081, Austin, Tx.</affiliation><affiliation>Physics Department, University of Rome, 00185, Rome, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Lothar</namePart><namePart type="family">Frommhold</namePart><affiliation>Physics Department, University of Texas, 78712-1081, Austin, Tx.</affiliation><affiliation>Physics Department, University of Rome, 00185, Rome, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">P.</namePart><namePart type="family">Dore</namePart><affiliation>Physics Department, University of Rome, 00185, Rome, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>Kluwer Academic Publishers-Plenum Publishers</publisher><place><placeTerm type="text">New York</placeTerm></place><dateCreated encoding="w3cdtf">1987-01-16</dateCreated><dateIssued encoding="w3cdtf">1987-04-01</dateIssued><copyrightDate encoding="w3cdtf">1987</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><abstract lang="en">Abstract: Recent progress in the field of binary collision induced spectra of nonpolar gases and mixtures in the far infrared (FIR) region of the spectrum includes accurate measurements of a variety of molecular systems and temperatures, and rigorous quantum calculations. The latter are based on the isotropic potential approximation and either on ab initio induced dipole data obtained with highly correlated wavefunctions, or on the classical multipole induction model. The contributions of both free pairs of molecules in collisional interaction, and bound pairs (van der Waals molecules), are accounted for in equilibrium proportions. The effects of the anisotropy of the intermolecular interaction potential on the spectra are also being understood in quantitative terms. On an absolute intensity scale, the agreement of theory with the laboratory measurements is typically well within the uncertainties of the measurements if all theoretical dimer features are flattened by convolution with with an instrumental profile of 10 or 20 cm−1 width; certain dimer features have been seen in the FIR spectra of the atmospheres of the outer planets and their big moons. For astrophysical and other applications, the results of the quantum computations have been cast into simple analytical expressions which reproduce collision induced spectra accurately as function of frequency and temperature on computers of small capacity in seconds for a selection of molecular systems.</abstract><subject lang="en"><genre>Key Words</genre><topic>collision-induction</topic><topic>far infrared and microwave absorption</topic><topic>supermolecular spectra</topic></subject><relatedItem type="host"><titleInfo><title>International Journal of Infrared and Millimeter Waves</title></titleInfo><titleInfo type="abbreviated"><title>Int J Infrared Milli Waves</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><originInfo><publisher>Springer</publisher><dateIssued encoding="w3cdtf">1987-04-01</dateIssued><copyrightDate encoding="w3cdtf">1987</copyrightDate></originInfo><subject><genre>Physics</genre><topic>Meteorology/Climatology</topic><topic>Astronomy</topic><topic>Electronic and Computer Engineering</topic></subject><identifier type="ISSN">0195-9271</identifier><identifier type="eISSN">1572-9559</identifier><identifier type="JournalID">10762</identifier><identifier type="IssueArticleCount">5</identifier><identifier type="VolumeIssueCount">12</identifier><part><date>1987</date><detail type="volume"><number>8</number><caption>vol.</caption></detail><detail type="issue"><number>4</number><caption>no.</caption></detail><extent unit="pages"><start>381</start><end>414</end></extent></part><recordInfo><recordOrigin>Plenum Publishing Corporation, 1987</recordOrigin></recordInfo></relatedItem><identifier type="istex">DCC7E9ED1F60AD29DA05A79E1503D18FE7E7F560</identifier><identifier type="ark">ark:/67375/VQC-G9TKX1MG-Q</identifier><identifier type="DOI">10.1007/BF01010737</identifier><identifier type="ArticleID">BF01010737</identifier><identifier type="ArticleID">Art4</identifier><accessCondition type="use and reproduction" contentType="copyright">Plenum Publishing Corporation, 1987</accessCondition><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-3XSW68JL-F">springer</recordContentSource><recordOrigin>Plenum Publishing Corporation, 1987</recordOrigin></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/ark:/67375/VQC-G9TKX1MG-Q/record.json</uri></json:item></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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