Multiple ionization in the earlier stages of water radiolysis
We have studied the fragmentation of water vapour molecules induced by collision with a Xe44+ beam at 6.7 MeV/u. From the measurement of the fragment time of flight, we show that the amount of fragmentation due to multiple ionization is very large. In the case of single ionization, we are able to re...
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| Veröffentlicht in: | Physics in medicine & biology 1998-08, Vol.43 (8), p.2347-2360 |
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| container_title | Physics in medicine & biology |
| container_volume | 43 |
| creator | Olivera, G H Caraby, C Jardin, P Cassimi, A Adoui, L Gervais, B |
| description | We have studied the fragmentation of water vapour molecules induced by collision with a Xe44+ beam at 6.7 MeV/u. From the measurement of the fragment time of flight, we show that the amount of fragmentation due to multiple ionization is very large. In the case of single ionization, we are able to reproduce accurately the experimental cross sections by calculating for each molecular level the single-ionization cross section in the framework of the CDW-EIS theory and with a diagram of dissociation modified with respect to the diagram obtained in the case of dipolar ionization. By using qualitative arguments based on the ability of the medium to neutralize a charged species, we tentatively extend our result to liquid water. From our analysis, we show that ionizations involving three or more ejected electrons could enhance the oxygen production. For the physicochemical phase we estimate that the rate of oxygen production by multiple ionization represents approximately 18% of the OH rate produced by single ionization. |
| doi_str_mv | 10.1088/0031-9155/43/8/025 |
| format | Article |
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From the measurement of the fragment time of flight, we show that the amount of fragmentation due to multiple ionization is very large. In the case of single ionization, we are able to reproduce accurately the experimental cross sections by calculating for each molecular level the single-ionization cross section in the framework of the CDW-EIS theory and with a diagram of dissociation modified with respect to the diagram obtained in the case of dipolar ionization. By using qualitative arguments based on the ability of the medium to neutralize a charged species, we tentatively extend our result to liquid water. From our analysis, we show that ionizations involving three or more ejected electrons could enhance the oxygen production. For the physicochemical phase we estimate that the rate of oxygen production by multiple ionization represents approximately 18% of the OH rate produced by single ionization.</description><identifier>ISSN: 0031-9155</identifier><identifier>EISSN: 1361-6560</identifier><identifier>DOI: 10.1088/0031-9155/43/8/025</identifier><identifier>PMID: 9725609</identifier><identifier>CODEN: PHMBA7</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Applied radiobiology (equipment, dosimetry...) ; Biological and medical sciences ; Biological effects of radiation ; Fundamental and applied biological sciences. 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From the measurement of the fragment time of flight, we show that the amount of fragmentation due to multiple ionization is very large. In the case of single ionization, we are able to reproduce accurately the experimental cross sections by calculating for each molecular level the single-ionization cross section in the framework of the CDW-EIS theory and with a diagram of dissociation modified with respect to the diagram obtained in the case of dipolar ionization. By using qualitative arguments based on the ability of the medium to neutralize a charged species, we tentatively extend our result to liquid water. From our analysis, we show that ionizations involving three or more ejected electrons could enhance the oxygen production. For the physicochemical phase we estimate that the rate of oxygen production by multiple ionization represents approximately 18% of the OH rate produced by single ionization.</description><subject>Applied radiobiology (equipment, dosimetry...)</subject><subject>Biological and medical sciences</subject><subject>Biological effects of radiation</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Oxygen</subject><subject>Physics</subject><subject>Radiation Effects</subject><subject>Radiochemistry</subject><subject>Spectrum Analysis</subject><subject>Tissues, organs and organisms biophysics</subject><subject>Water - chemistry</subject><subject>Xenon Radioisotopes</subject><issn>0031-9155</issn><issn>1361-6560</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkE9Lw0AQxRdRaq1-AUHIwUsPsbP_kuzBQylqhYoXPS_TZNeupE3Ipkr99G5IycWLp-HN_N7M8Ai5pnBHIctmAJzGiko5E3wWJJMnZEx5QuNEJnBKxgNwTi68_wSgNGNiREYqZYFQY3L_si9bV5cmctXO_WAbSuR2UbsxkcGmdKaJfIsfxkeVjb6xDbrBwlXlwTt_Sc4slt5cHeuEvD8-vC2W8er16XkxX8W5UKqNJaeSoQWmLJOo1lwpmSsUMi9SmSnOASWVBVhTAAibJSy8p5SgwEWWc8onZNrv3WCp68ZtsTnoCp1ezle664GgqUoV_-pY1rN5U3nfGDsYKOguNt2lortUtOA6SCaD6aY31fv11hSD5ZhTmN8e5-hzLG2Du9z5AWNcKMh4wOIec1X9v7PTv_xfTteF5b9Nl4xY</recordid><startdate>19980801</startdate><enddate>19980801</enddate><creator>Olivera, G H</creator><creator>Caraby, C</creator><creator>Jardin, P</creator><creator>Cassimi, A</creator><creator>Adoui, L</creator><creator>Gervais, B</creator><general>IOP Publishing</general><general>Institute of Physics</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-3367-4066</orcidid></search><sort><creationdate>19980801</creationdate><title>Multiple ionization in the earlier stages of water radiolysis</title><author>Olivera, G H ; Caraby, C ; Jardin, P ; Cassimi, A ; Adoui, L ; Gervais, B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c499t-53152af029f25a9b3995c9a45cd7589330a515d0fed004f86272599410348c313</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Applied radiobiology (equipment, dosimetry...)</topic><topic>Biological and medical sciences</topic><topic>Biological effects of radiation</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Oxygen</topic><topic>Physics</topic><topic>Radiation Effects</topic><topic>Radiochemistry</topic><topic>Spectrum Analysis</topic><topic>Tissues, organs and organisms biophysics</topic><topic>Water - chemistry</topic><topic>Xenon Radioisotopes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Olivera, G H</creatorcontrib><creatorcontrib>Caraby, C</creatorcontrib><creatorcontrib>Jardin, P</creatorcontrib><creatorcontrib>Cassimi, A</creatorcontrib><creatorcontrib>Adoui, L</creatorcontrib><creatorcontrib>Gervais, B</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Physics in medicine & biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Olivera, G H</au><au>Caraby, C</au><au>Jardin, P</au><au>Cassimi, A</au><au>Adoui, L</au><au>Gervais, B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Multiple ionization in the earlier stages of water radiolysis</atitle><jtitle>Physics in medicine & biology</jtitle><addtitle>Phys Med Biol</addtitle><date>1998-08-01</date><risdate>1998</risdate><volume>43</volume><issue>8</issue><spage>2347</spage><epage>2360</epage><pages>2347-2360</pages><issn>0031-9155</issn><eissn>1361-6560</eissn><coden>PHMBA7</coden><abstract>We have studied the fragmentation of water vapour molecules induced by collision with a Xe44+ beam at 6.7 MeV/u. From the measurement of the fragment time of flight, we show that the amount of fragmentation due to multiple ionization is very large. In the case of single ionization, we are able to reproduce accurately the experimental cross sections by calculating for each molecular level the single-ionization cross section in the framework of the CDW-EIS theory and with a diagram of dissociation modified with respect to the diagram obtained in the case of dipolar ionization. By using qualitative arguments based on the ability of the medium to neutralize a charged species, we tentatively extend our result to liquid water. From our analysis, we show that ionizations involving three or more ejected electrons could enhance the oxygen production. For the physicochemical phase we estimate that the rate of oxygen production by multiple ionization represents approximately 18% of the OH rate produced by single ionization.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><pmid>9725609</pmid><doi>10.1088/0031-9155/43/8/025</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-3367-4066</orcidid></addata></record> |
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| ispartof | Physics in medicine & biology, 1998-08, Vol.43 (8), p.2347-2360 |
| issn | 0031-9155 1361-6560 |
| language | eng |
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| source | MEDLINE; IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Applied radiobiology (equipment, dosimetry...) Biological and medical sciences Biological effects of radiation Fundamental and applied biological sciences. Psychology Oxygen Physics Radiation Effects Radiochemistry Spectrum Analysis Tissues, organs and organisms biophysics Water - chemistry Xenon Radioisotopes |
| title | Multiple ionization in the earlier stages of water radiolysis |
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