Pulse radiolysis in an applied magnetic field. The time dependence of the magnetic field enhancement of the fluorescence from solutions of fluorene in squalane
The effect of a magnetic field on the light emission from squalane solutions of fluorene, pulse irradiated at the center of a large electromagnet, is described. The fluorescence intensity following pulse radiolysis was found to be 40 to 50 percent higher in an applied field of 0.3 T (3000 G) and the...
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| Veröffentlicht in: | J. Phys. Chem.; (United States) 1977-05, Vol.81 (9), p.815-819 |
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| container_issue | 9 |
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| container_title | J. Phys. Chem.; (United States) |
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| creator | Sargent, F. P Brocklehurst, B Dixon, R. S Gardy, E. M Lopata, V. J Singh, Ajit |
| description | The effect of a magnetic field on the light emission from squalane solutions of fluorene, pulse irradiated at the center of a large electromagnet, is described. The fluorescence intensity following pulse radiolysis was found to be 40 to 50 percent higher in an applied field of 0.3 T (3000 G) and the triplet yield showed a small decrease. The enhancement of the singlet emission is attributed to an increase in the fraction of geminate solute ion recombinations leading to excited singlet fluorene. The magnetic field effect was time dependent, being undetectable during the pulse and reaching a maximum value after about 100 ns. These observations are compared with the theory of Brocklehurst which describes the singlet to triplet conversion of geminate solute ion pairs quantitatively in terms of the electron--nuclear hyperfine interactions in the radical ions. After correction for the large in-pulse fluorescence and its decay, satisfactory agreement between experiment and theory was obtained. The results emphasize the importance of ion recombination in the generation of excited states in radiolysis and confirm the role of the electron--nuclear spin interaction in determining the ratio of singlet and triplet yields. |
| doi_str_mv | 10.1021/j100524a002 |
| format | Article |
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The time dependence of the magnetic field enhancement of the fluorescence from solutions of fluorene in squalane</title><source>ACS Publications</source><creator>Sargent, F. P ; Brocklehurst, B ; Dixon, R. S ; Gardy, E. M ; Lopata, V. J ; Singh, Ajit</creator><creatorcontrib>Sargent, F. P ; Brocklehurst, B ; Dixon, R. S ; Gardy, E. M ; Lopata, V. J ; Singh, Ajit ; Whiteshell Nuclear Research Establishment, Manitoba, Can</creatorcontrib><description>The effect of a magnetic field on the light emission from squalane solutions of fluorene, pulse irradiated at the center of a large electromagnet, is described. The fluorescence intensity following pulse radiolysis was found to be 40 to 50 percent higher in an applied field of 0.3 T (3000 G) and the triplet yield showed a small decrease. The enhancement of the singlet emission is attributed to an increase in the fraction of geminate solute ion recombinations leading to excited singlet fluorene. The magnetic field effect was time dependent, being undetectable during the pulse and reaching a maximum value after about 100 ns. These observations are compared with the theory of Brocklehurst which describes the singlet to triplet conversion of geminate solute ion pairs quantitatively in terms of the electron--nuclear hyperfine interactions in the radical ions. After correction for the large in-pulse fluorescence and its decay, satisfactory agreement between experiment and theory was obtained. The results emphasize the importance of ion recombination in the generation of excited states in radiolysis and confirm the role of the electron--nuclear spin interaction in determining the ratio of singlet and triplet yields.</description><identifier>ISSN: 0022-3654</identifier><identifier>EISSN: 1541-5740</identifier><identifier>DOI: 10.1021/j100524a002</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>400600 - Radiation Chemistry ; ALKANES ; AROMATICS ; CHEMICAL RADIATION EFFECTS ; CHEMICAL REACTIONS ; CHEMISTRY ; CONDENSED AROMATICS ; DECOMPOSITION ; FLUORENE ; FLUORESCENCE ; HYDROCARBONS ; IRRADIATION ; LUMINESCENCE ; MAGNETIC FIELDS ; ORGANIC COMPOUNDS ; PULSED IRRADIATION ; RADIATION CHEMISTRY ; RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY ; RADIATION EFFECTS ; RADIOLYSIS ; SOLVENT PROPERTIES ; SQUALANE ; TIME DEPENDENCE</subject><ispartof>J. Phys. Chem.; (United States), 1977-05, Vol.81 (9), p.815-819</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a396t-14a200189c0b1661fceb701e1e2de01ed4b294c91519a58c90bacca0065ca90b3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/j100524a002$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/j100524a002$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,777,781,882,2752,27057,27905,27906,56719,56769</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/7098461$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Sargent, F. P</creatorcontrib><creatorcontrib>Brocklehurst, B</creatorcontrib><creatorcontrib>Dixon, R. S</creatorcontrib><creatorcontrib>Gardy, E. M</creatorcontrib><creatorcontrib>Lopata, V. J</creatorcontrib><creatorcontrib>Singh, Ajit</creatorcontrib><creatorcontrib>Whiteshell Nuclear Research Establishment, Manitoba, Can</creatorcontrib><title>Pulse radiolysis in an applied magnetic field. The time dependence of the magnetic field enhancement of the fluorescence from solutions of fluorene in squalane</title><title>J. Phys. Chem.; (United States)</title><addtitle>J. Phys. Chem</addtitle><description>The effect of a magnetic field on the light emission from squalane solutions of fluorene, pulse irradiated at the center of a large electromagnet, is described. The fluorescence intensity following pulse radiolysis was found to be 40 to 50 percent higher in an applied field of 0.3 T (3000 G) and the triplet yield showed a small decrease. The enhancement of the singlet emission is attributed to an increase in the fraction of geminate solute ion recombinations leading to excited singlet fluorene. The magnetic field effect was time dependent, being undetectable during the pulse and reaching a maximum value after about 100 ns. These observations are compared with the theory of Brocklehurst which describes the singlet to triplet conversion of geminate solute ion pairs quantitatively in terms of the electron--nuclear hyperfine interactions in the radical ions. After correction for the large in-pulse fluorescence and its decay, satisfactory agreement between experiment and theory was obtained. The results emphasize the importance of ion recombination in the generation of excited states in radiolysis and confirm the role of the electron--nuclear spin interaction in determining the ratio of singlet and triplet yields.</description><subject>400600 - Radiation Chemistry</subject><subject>ALKANES</subject><subject>AROMATICS</subject><subject>CHEMICAL RADIATION EFFECTS</subject><subject>CHEMICAL REACTIONS</subject><subject>CHEMISTRY</subject><subject>CONDENSED AROMATICS</subject><subject>DECOMPOSITION</subject><subject>FLUORENE</subject><subject>FLUORESCENCE</subject><subject>HYDROCARBONS</subject><subject>IRRADIATION</subject><subject>LUMINESCENCE</subject><subject>MAGNETIC FIELDS</subject><subject>ORGANIC COMPOUNDS</subject><subject>PULSED IRRADIATION</subject><subject>RADIATION CHEMISTRY</subject><subject>RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY</subject><subject>RADIATION EFFECTS</subject><subject>RADIOLYSIS</subject><subject>SOLVENT PROPERTIES</subject><subject>SQUALANE</subject><subject>TIME DEPENDENCE</subject><issn>0022-3654</issn><issn>1541-5740</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1977</creationdate><recordtype>article</recordtype><recordid>eNptkVtL7DAQx4MouF6e_ALhvPgg1UybtttHWY43BG8riC8hm07d7GmTNUlBP41f1axVOYIwMMzMb_7MhZA9YIfAUjhaAGN5yiVj6RoZQc4hyUvO1skoZtIkK3K-Sba8XzDGIMtgRN6u-9YjdbLWtn312lNtqIy2XLYaa9rJJ4NBK9pobOtDOp0jDbpDWuMSTY1GIbUNDTH9E6Vo5jJWOzThi2ja3jr06qOrcbaj3rZ90Nb4FTKUDa5G8M-9bKXBHbLRyDjh7qffJvcnf6eTs-Ty6vR8cnyZyKwqQgJcpnGlcaXYDIoCGoWzkgECpjVGX_NZWnFVQQ6VzMeqYjOpVLxTkSsZg2yb_Bl0rQ9aeKUDqrmyxqAKomTVmBcQoYMBUs5677ARS6c76V4FMLF6gPjvAZFOBlr7gC_fqHT_RFFmZS6m13eC3z7eXDxMmJhGfn_gpfJiYXtn4sK_Kr8D1h2WPw</recordid><startdate>197705</startdate><enddate>197705</enddate><creator>Sargent, F. P</creator><creator>Brocklehurst, B</creator><creator>Dixon, R. S</creator><creator>Gardy, E. M</creator><creator>Lopata, V. J</creator><creator>Singh, Ajit</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>197705</creationdate><title>Pulse radiolysis in an applied magnetic field. The time dependence of the magnetic field enhancement of the fluorescence from solutions of fluorene in squalane</title><author>Sargent, F. P ; Brocklehurst, B ; Dixon, R. S ; Gardy, E. M ; Lopata, V. J ; Singh, Ajit</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a396t-14a200189c0b1661fceb701e1e2de01ed4b294c91519a58c90bacca0065ca90b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1977</creationdate><topic>400600 - Radiation Chemistry</topic><topic>ALKANES</topic><topic>AROMATICS</topic><topic>CHEMICAL RADIATION EFFECTS</topic><topic>CHEMICAL REACTIONS</topic><topic>CHEMISTRY</topic><topic>CONDENSED AROMATICS</topic><topic>DECOMPOSITION</topic><topic>FLUORENE</topic><topic>FLUORESCENCE</topic><topic>HYDROCARBONS</topic><topic>IRRADIATION</topic><topic>LUMINESCENCE</topic><topic>MAGNETIC FIELDS</topic><topic>ORGANIC COMPOUNDS</topic><topic>PULSED IRRADIATION</topic><topic>RADIATION CHEMISTRY</topic><topic>RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY</topic><topic>RADIATION EFFECTS</topic><topic>RADIOLYSIS</topic><topic>SOLVENT PROPERTIES</topic><topic>SQUALANE</topic><topic>TIME DEPENDENCE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sargent, F. P</creatorcontrib><creatorcontrib>Brocklehurst, B</creatorcontrib><creatorcontrib>Dixon, R. S</creatorcontrib><creatorcontrib>Gardy, E. M</creatorcontrib><creatorcontrib>Lopata, V. J</creatorcontrib><creatorcontrib>Singh, Ajit</creatorcontrib><creatorcontrib>Whiteshell Nuclear Research Establishment, Manitoba, Can</creatorcontrib><collection>Istex</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>Sargent, F. P</au><au>Brocklehurst, B</au><au>Dixon, R. S</au><au>Gardy, E. M</au><au>Lopata, V. J</au><au>Singh, Ajit</au><aucorp>Whiteshell Nuclear Research Establishment, Manitoba, Can</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pulse radiolysis in an applied magnetic field. The time dependence of the magnetic field enhancement of the fluorescence from solutions of fluorene in squalane</atitle><jtitle>J. Phys. Chem.; (United States)</jtitle><addtitle>J. Phys. Chem</addtitle><date>1977-05</date><risdate>1977</risdate><volume>81</volume><issue>9</issue><spage>815</spage><epage>819</epage><pages>815-819</pages><issn>0022-3654</issn><eissn>1541-5740</eissn><abstract>The effect of a magnetic field on the light emission from squalane solutions of fluorene, pulse irradiated at the center of a large electromagnet, is described. The fluorescence intensity following pulse radiolysis was found to be 40 to 50 percent higher in an applied field of 0.3 T (3000 G) and the triplet yield showed a small decrease. The enhancement of the singlet emission is attributed to an increase in the fraction of geminate solute ion recombinations leading to excited singlet fluorene. The magnetic field effect was time dependent, being undetectable during the pulse and reaching a maximum value after about 100 ns. These observations are compared with the theory of Brocklehurst which describes the singlet to triplet conversion of geminate solute ion pairs quantitatively in terms of the electron--nuclear hyperfine interactions in the radical ions. After correction for the large in-pulse fluorescence and its decay, satisfactory agreement between experiment and theory was obtained. The results emphasize the importance of ion recombination in the generation of excited states in radiolysis and confirm the role of the electron--nuclear spin interaction in determining the ratio of singlet and triplet yields.</abstract><cop>United States</cop><pub>American Chemical Society</pub><doi>10.1021/j100524a002</doi><tpages>5</tpages></addata></record> |
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| issn | 0022-3654 1541-5740 |
| language | eng |
| recordid | cdi_crossref_primary_10_1021_j100524a002 |
| source | ACS Publications |
| subjects | 400600 - Radiation Chemistry ALKANES AROMATICS CHEMICAL RADIATION EFFECTS CHEMICAL REACTIONS CHEMISTRY CONDENSED AROMATICS DECOMPOSITION FLUORENE FLUORESCENCE HYDROCARBONS IRRADIATION LUMINESCENCE MAGNETIC FIELDS ORGANIC COMPOUNDS PULSED IRRADIATION RADIATION CHEMISTRY RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY RADIATION EFFECTS RADIOLYSIS SOLVENT PROPERTIES SQUALANE TIME DEPENDENCE |
| title | Pulse radiolysis in an applied magnetic field. The time dependence of the magnetic field enhancement of the fluorescence from solutions of fluorene in squalane |
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