Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms
Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a w...
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| Veröffentlicht in: | J. Phys. Chem.; (United States) 1987-10, Vol.91 (21), p.5402-5409 |
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| container_end_page | 5409 |
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| container_issue | 21 |
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| container_title | J. Phys. Chem.; (United States) |
| container_volume | 91 |
| creator | Band, Yehuda B Freed, Karl F Singer, Sherwin J Williams, Carl J |
| description | Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. They discuss how totally oriented fragments can be produced by near-threshold photodissociation in a magnetic field. |
| doi_str_mv | 10.1021/j100305a005 |
| format | Article |
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The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. 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Phys. Chem.; (United States)</title><addtitle>J. Phys. Chem</addtitle><description>Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. They discuss how totally oriented fragments can be produced by near-threshold photodissociation in a magnetic field.</description><subject>400500 - Photochemistry</subject><subject>ALKYL RADICALS</subject><subject>ANGULAR DISTRIBUTION</subject><subject>CARBON</subject><subject>CATIONS</subject><subject>CHARGED PARTICLES</subject><subject>CHEMISTRY</subject><subject>DATA</subject><subject>DISSOCIATION</subject><subject>DISTRIBUTION</subject><subject>ELEMENTS</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>HYDROGEN</subject><subject>INFORMATION</subject><subject>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</subject><subject>IONS</subject><subject>MAGNETIC FIELDS</subject><subject>NONMETALS</subject><subject>NUMERICAL DATA</subject><subject>PHOTOCHEMISTRY</subject><subject>Physical chemistry of induced reactions (with radiations, particles and ultrasonics)</subject><subject>POLARIZATION</subject><subject>RADICALS</subject><subject>THEORETICAL DATA</subject><issn>0022-3654</issn><issn>1541-5740</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1987</creationdate><recordtype>article</recordtype><recordid>eNpt0MtKxDAUBuAgCo6XlS9QRHAh1ZMm6WUp4g0GFRwR3IRMesJk7DRDTwR9ezNUxIWrQP7vhJyfsSMO5xwKfrHkAAKUAVBbbMKV5LmqJGyzCUBR5KJUcpftES0BgAvBJ-z1IfSm9WZuorcZOoc2Uhb6LC4wWy9CDK0nCtanPN0GlyUcwyrhVejQfnRIWQxZWGOf0wK7LtvEdMB2nOkID3_OffZycz27usunj7f3V5fT3AhVxbxoeQtlVVcOhFOtKIpauQZrnLfoSuUq1ciyreVcNQo5ljWoJnEpUAJK6cQ-Ox7fDRS9Jusj2oUNfZ_20GkYGqkSOhuRHQLRgE6vB78yw5fmoDfF6T_FJX0y6rUhazo3mN56-h2pRAO8hsTykXmK-Pkbm-Fdl5WolJ49Pevnuni7gynXdfKnozeW9DJ8DH3q5d8PfAMysIed</recordid><startdate>19871001</startdate><enddate>19871001</enddate><creator>Band, Yehuda B</creator><creator>Freed, Karl F</creator><creator>Singer, Sherwin J</creator><creator>Williams, Carl J</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19871001</creationdate><title>Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms</title><author>Band, Yehuda B ; Freed, Karl F ; Singer, Sherwin J ; Williams, Carl J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a357t-2d1d06787f03f5d32285f9e8ebdef65f75946d84b595e1e6805967843e40e44f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1987</creationdate><topic>400500 - Photochemistry</topic><topic>ALKYL RADICALS</topic><topic>ANGULAR DISTRIBUTION</topic><topic>CARBON</topic><topic>CATIONS</topic><topic>CHARGED PARTICLES</topic><topic>CHEMISTRY</topic><topic>DATA</topic><topic>DISSOCIATION</topic><topic>DISTRIBUTION</topic><topic>ELEMENTS</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>HYDROGEN</topic><topic>INFORMATION</topic><topic>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</topic><topic>IONS</topic><topic>MAGNETIC FIELDS</topic><topic>NONMETALS</topic><topic>NUMERICAL DATA</topic><topic>PHOTOCHEMISTRY</topic><topic>Physical chemistry of induced reactions (with radiations, particles and ultrasonics)</topic><topic>POLARIZATION</topic><topic>RADICALS</topic><topic>THEORETICAL DATA</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Band, Yehuda B</creatorcontrib><creatorcontrib>Freed, Karl F</creatorcontrib><creatorcontrib>Singer, Sherwin J</creatorcontrib><creatorcontrib>Williams, Carl J</creatorcontrib><creatorcontrib>Ben Gurion Univ., Beer-Sheva, Israel</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>J. Phys. Chem.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Band, Yehuda B</au><au>Freed, Karl F</au><au>Singer, Sherwin J</au><au>Williams, Carl J</au><aucorp>Ben Gurion Univ., Beer-Sheva, Israel</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms</atitle><jtitle>J. Phys. Chem.; (United States)</jtitle><addtitle>J. Phys. Chem</addtitle><date>1987-10-01</date><risdate>1987</risdate><volume>91</volume><issue>21</issue><spage>5402</spage><epage>5409</epage><pages>5402-5409</pages><issn>0022-3654</issn><eissn>1541-5740</eissn><coden>JPCHAX</coden><abstract>Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. They discuss how totally oriented fragments can be produced by near-threshold photodissociation in a magnetic field.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/j100305a005</doi><tpages>8</tpages></addata></record> |
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| ispartof | J. Phys. Chem.; (United States), 1987-10, Vol.91 (21), p.5402-5409 |
| issn | 0022-3654 1541-5740 |
| language | eng |
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| source | ACS Publications |
| subjects | 400500 - Photochemistry ALKYL RADICALS ANGULAR DISTRIBUTION CARBON CATIONS CHARGED PARTICLES CHEMISTRY DATA DISSOCIATION DISTRIBUTION ELEMENTS Exact sciences and technology General and physical chemistry HYDROGEN INFORMATION INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY IONS MAGNETIC FIELDS NONMETALS NUMERICAL DATA PHOTOCHEMISTRY Physical chemistry of induced reactions (with radiations, particles and ultrasonics) POLARIZATION RADICALS THEORETICAL DATA |
| title | Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms |
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