Photodissociation and Radiative Association of HeH+ in the Metastable Triplet State
We investigate the photodissociation of HeH+ in the metastable triplet state as well as its formation through the inverse process, radiative association. In models of astrophysical plasmas, HeH+ is assumed to be present only in the ground state, and the influence of the triplet state has not been ex...
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| Veröffentlicht in: | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2013-10, Vol.117 (39), p.9486-9492 |
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| container_end_page | 9492 |
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| container_issue | 39 |
| container_start_page | 9486 |
| container_title | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory |
| container_volume | 117 |
| creator | Loreau, J Vranckx, S Desouter-Lecomte, M Vaeck, N Dalgarno, A |
| description | We investigate the photodissociation of HeH+ in the metastable triplet state as well as its formation through the inverse process, radiative association. In models of astrophysical plasmas, HeH+ is assumed to be present only in the ground state, and the influence of the triplet state has not been explored. It may be formed by radiative association during collisions between a proton and metastable helium, which are present in significant concentrations in nebulae. The triplet state can also be formed by association of He+ and H, although this process is less likely to occur. We compute the cross sections and rate coefficients corresponding to the photodissociation of the triplet state by UV photons from a central star using a wave packet method. We show that the photodissociation cross sections depend strongly on the initial vibrational state and that the effects of excited electronic states and nonadiabatic couplings cannot be neglected. We then calculate the cross section and rate coefficient for the radiative association of HeH+ in the metastable triplet state. |
| doi_str_mv | 10.1021/jp312007q |
| format | Article |
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In models of astrophysical plasmas, HeH+ is assumed to be present only in the ground state, and the influence of the triplet state has not been explored. It may be formed by radiative association during collisions between a proton and metastable helium, which are present in significant concentrations in nebulae. The triplet state can also be formed by association of He+ and H, although this process is less likely to occur. We compute the cross sections and rate coefficients corresponding to the photodissociation of the triplet state by UV photons from a central star using a wave packet method. We show that the photodissociation cross sections depend strongly on the initial vibrational state and that the effects of excited electronic states and nonadiabatic couplings cannot be neglected. We then calculate the cross section and rate coefficient for the radiative association of HeH+ in the metastable triplet state.</description><identifier>ISSN: 1089-5639</identifier><identifier>EISSN: 1520-5215</identifier><identifier>DOI: 10.1021/jp312007q</identifier><identifier>PMID: 23437906</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Atomic and molecular physics ; Diffuse spectra; predissociation, photodissociation ; Exact sciences and technology ; Molecular properties and interactions with photons ; Photon interactions with molecules ; Physics</subject><ispartof>The journal of physical chemistry. 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A, Molecules, spectroscopy, kinetics, environment, & general theory</title><addtitle>J. Phys. Chem. A</addtitle><description>We investigate the photodissociation of HeH+ in the metastable triplet state as well as its formation through the inverse process, radiative association. In models of astrophysical plasmas, HeH+ is assumed to be present only in the ground state, and the influence of the triplet state has not been explored. It may be formed by radiative association during collisions between a proton and metastable helium, which are present in significant concentrations in nebulae. The triplet state can also be formed by association of He+ and H, although this process is less likely to occur. We compute the cross sections and rate coefficients corresponding to the photodissociation of the triplet state by UV photons from a central star using a wave packet method. We show that the photodissociation cross sections depend strongly on the initial vibrational state and that the effects of excited electronic states and nonadiabatic couplings cannot be neglected. We then calculate the cross section and rate coefficient for the radiative association of HeH+ in the metastable triplet state.</description><subject>Atomic and molecular physics</subject><subject>Diffuse spectra; predissociation, photodissociation</subject><subject>Exact sciences and technology</subject><subject>Molecular properties and interactions with photons</subject><subject>Photon interactions with molecules</subject><subject>Physics</subject><issn>1089-5639</issn><issn>1520-5215</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNptkM9LwzAUgIMobk4P_gOSi6BINWmaZjmOoU6YKG6ey2uTsI6u6ZpU8L83Y3Pz4OX94H289_gQuqTknpKYPiwbRmNCxPoI9SmPScRjyo9DTYYy4imTPXTm3JIQQlmcnKJezBImJEn7aPa-sN6q0jlblOBLW2OoFf4Atem-NB79mViDJ3pyh8sa-4XGr9qD85BXGs_bsqm0xzMPXp-jEwOV0xe7PECfT4_z8SSavj2_jEfTCFjCfSTC75BToopcMQ5GDgnkBdUQc5kyZUAZJlJOQxxSQ43QgquAJLlUiVA5G6Cb7d6mtetOO5-tSlfoqoJa285lNJGSBhNUBvR2ixatda7VJmvacgXtd0ZJtnGY7R0G9mq3tstXWu3JX2kBuN4B4AqoTAt1UboDJ4YykVweOChctrRdWwcb_xz8AYLXhTg</recordid><startdate>20131003</startdate><enddate>20131003</enddate><creator>Loreau, J</creator><creator>Vranckx, S</creator><creator>Desouter-Lecomte, M</creator><creator>Vaeck, N</creator><creator>Dalgarno, A</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20131003</creationdate><title>Photodissociation and Radiative Association of HeH+ in the Metastable Triplet State</title><author>Loreau, J ; Vranckx, S ; Desouter-Lecomte, M ; Vaeck, N ; Dalgarno, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a345t-7102ab10dcbd35af980abc1ea25963dfadf37651f3781f1f7e75d0ab4b9d47db3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Atomic and molecular physics</topic><topic>Diffuse spectra; predissociation, photodissociation</topic><topic>Exact sciences and technology</topic><topic>Molecular properties and interactions with photons</topic><topic>Photon interactions with molecules</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Loreau, J</creatorcontrib><creatorcontrib>Vranckx, S</creatorcontrib><creatorcontrib>Desouter-Lecomte, M</creatorcontrib><creatorcontrib>Vaeck, N</creatorcontrib><creatorcontrib>Dalgarno, A</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Loreau, J</au><au>Vranckx, S</au><au>Desouter-Lecomte, M</au><au>Vaeck, N</au><au>Dalgarno, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photodissociation and Radiative Association of HeH+ in the Metastable Triplet State</atitle><jtitle>The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory</jtitle><addtitle>J. Phys. Chem. A</addtitle><date>2013-10-03</date><risdate>2013</risdate><volume>117</volume><issue>39</issue><spage>9486</spage><epage>9492</epage><pages>9486-9492</pages><issn>1089-5639</issn><eissn>1520-5215</eissn><abstract>We investigate the photodissociation of HeH+ in the metastable triplet state as well as its formation through the inverse process, radiative association. In models of astrophysical plasmas, HeH+ is assumed to be present only in the ground state, and the influence of the triplet state has not been explored. It may be formed by radiative association during collisions between a proton and metastable helium, which are present in significant concentrations in nebulae. The triplet state can also be formed by association of He+ and H, although this process is less likely to occur. We compute the cross sections and rate coefficients corresponding to the photodissociation of the triplet state by UV photons from a central star using a wave packet method. We show that the photodissociation cross sections depend strongly on the initial vibrational state and that the effects of excited electronic states and nonadiabatic couplings cannot be neglected. We then calculate the cross section and rate coefficient for the radiative association of HeH+ in the metastable triplet state.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>23437906</pmid><doi>10.1021/jp312007q</doi><tpages>7</tpages></addata></record> |
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| source | ACS Publications |
| subjects | Atomic and molecular physics Diffuse spectra predissociation, photodissociation Exact sciences and technology Molecular properties and interactions with photons Photon interactions with molecules Physics |
| title | Photodissociation and Radiative Association of HeH+ in the Metastable Triplet State |
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