CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure
The UV absorption cross-sections of the Criegee intermediate CH2OO, and kinetics of the CH2OO self-reaction and the reaction of CH2OO with I are reported as a function of pressure at 298 K. Measurements were made using pulsed laser flash photolysis of CH2I2/O-2/N-2 gas mixtures coupled with time-res...
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| Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2020-05, Vol.22 (17), p.9448-9459 |
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| creator | Mir, Zara S. Lewis, Thomas R. Onel, Lavinia Blitz, Mark A. Seakins, Paul W. Stone, Daniel |
| description | The UV absorption cross-sections of the Criegee intermediate CH2OO, and kinetics of the CH2OO self-reaction and the reaction of CH2OO with I are reported as a function of pressure at 298 K. Measurements were made using pulsed laser flash photolysis of CH2I2/O-2/N-2 gas mixtures coupled with time-resolved broadband UV absorption spectroscopy at pressures between 6 and 300 Torr. Results give a peak absorption cross-section of (1.37 +/- 0.29) x 10(-17) cm(2) at similar to 340 nm and a rate coefficient for the CH2OO self-reaction of (8.0 +/- 1.1) x 10(-11) cm(3) s(-1), with no significant pressure dependence of the absorption cross-sections or the self-reaction kinetics over the range investigated. The rate coefficient for the reaction between CH2OO and I demonstrates pressure dependence over the range investigated, with a Lindemann fit giving k(0) = (4.4 +/- 1.0) x 10(-29) cm(6) s(-1) and k(infinity) = (6.7 +/- 0.6) x 10(-11) cm(3) s(-1). The origins of IO in the system have been investigated, the implications of which are discussed. |
| doi_str_mv | 10.1039/d0cp00988a |
| format | Article |
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Measurements were made using pulsed laser flash photolysis of CH2I2/O-2/N-2 gas mixtures coupled with time-resolved broadband UV absorption spectroscopy at pressures between 6 and 300 Torr. Results give a peak absorption cross-section of (1.37 +/- 0.29) x 10(-17) cm(2) at similar to 340 nm and a rate coefficient for the CH2OO self-reaction of (8.0 +/- 1.1) x 10(-11) cm(3) s(-1), with no significant pressure dependence of the absorption cross-sections or the self-reaction kinetics over the range investigated. The rate coefficient for the reaction between CH2OO and I demonstrates pressure dependence over the range investigated, with a Lindemann fit giving k(0) = (4.4 +/- 1.0) x 10(-29) cm(6) s(-1) and k(infinity) = (6.7 +/- 0.6) x 10(-11) cm(3) s(-1). The origins of IO in the system have been investigated, the implications of which are discussed.</description><identifier>ISSN: 1463-9076</identifier><identifier>EISSN: 1463-9084</identifier><identifier>DOI: 10.1039/d0cp00988a</identifier><identifier>PMID: 32314758</identifier><language>eng</language><publisher>CAMBRIDGE: Royal Soc Chemistry</publisher><subject>Absorption cross sections ; Broadband ; Chemistry ; Chemistry, Physical ; Flash photolysis ; Gas mixtures ; Physical Sciences ; Physics ; Physics, Atomic, Molecular & Chemical ; Pressure dependence ; Pulsed lasers ; Reaction kinetics ; Science & Technology ; Ultraviolet radiation</subject><ispartof>Physical chemistry chemical physics : PCCP, 2020-05, Vol.22 (17), p.9448-9459</ispartof><rights>Copyright Royal Society of Chemistry 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>26</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000532479300027</woscitedreferencesoriginalsourcerecordid><cites>FETCH-LOGICAL-g289t-82519645a3b6063f2cb7082743fd8565f0d8eb48caa223dfaeeb6b91f4f649c93</cites><orcidid>0000-0002-0637-9141 ; 0000-0002-4335-8593</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785,27929,27930,28253</link.rule.ids></links><search><creatorcontrib>Mir, Zara S.</creatorcontrib><creatorcontrib>Lewis, Thomas R.</creatorcontrib><creatorcontrib>Onel, Lavinia</creatorcontrib><creatorcontrib>Blitz, Mark A.</creatorcontrib><creatorcontrib>Seakins, Paul W.</creatorcontrib><creatorcontrib>Stone, Daniel</creatorcontrib><title>CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure</title><title>Physical chemistry chemical physics : PCCP</title><addtitle>PHYS CHEM CHEM PHYS</addtitle><description>The UV absorption cross-sections of the Criegee intermediate CH2OO, and kinetics of the CH2OO self-reaction and the reaction of CH2OO with I are reported as a function of pressure at 298 K. Measurements were made using pulsed laser flash photolysis of CH2I2/O-2/N-2 gas mixtures coupled with time-resolved broadband UV absorption spectroscopy at pressures between 6 and 300 Torr. Results give a peak absorption cross-section of (1.37 +/- 0.29) x 10(-17) cm(2) at similar to 340 nm and a rate coefficient for the CH2OO self-reaction of (8.0 +/- 1.1) x 10(-11) cm(3) s(-1), with no significant pressure dependence of the absorption cross-sections or the self-reaction kinetics over the range investigated. The rate coefficient for the reaction between CH2OO and I demonstrates pressure dependence over the range investigated, with a Lindemann fit giving k(0) = (4.4 +/- 1.0) x 10(-29) cm(6) s(-1) and k(infinity) = (6.7 +/- 0.6) x 10(-11) cm(3) s(-1). The origins of IO in the system have been investigated, the implications of which are discussed.</description><subject>Absorption cross sections</subject><subject>Broadband</subject><subject>Chemistry</subject><subject>Chemistry, Physical</subject><subject>Flash photolysis</subject><subject>Gas mixtures</subject><subject>Physical Sciences</subject><subject>Physics</subject><subject>Physics, Atomic, Molecular & Chemical</subject><subject>Pressure dependence</subject><subject>Pulsed lasers</subject><subject>Reaction kinetics</subject><subject>Science & Technology</subject><subject>Ultraviolet radiation</subject><issn>1463-9076</issn><issn>1463-9084</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>AOWDO</sourceid><recordid>eNqNkMlOwzAQhi0EYilceAJLXJBQwFsS-4gilkqVeqFcK8cZVy6tHexEiAPvTkKBAydOs33_r5lB6JySa0q4ummIaQlRUuo9dExFwTNFpNj_zcviCJ2ktCaE0JzyQ3TEGaeizOUx-qge2XyOq-hgBYCd7yBuoXG6A7x4xrpOIbadCx6bGFLKEpixSlj7Br84D50zCQeLdz5X33Gc_nSmWA84tr3_ko5wGyGlPsIpOrB6k-DsO07Q4v7uqXrMZvOHaXU7y1ZMqi6TLKeqELnmdUEKbpmpSyJZKbhtZF7kljQSaiGN1ozxxmqAuqgVtcIWQhnFJ-hy59vG8NpD6pZblwxsNtpD6NOSccWJIJzSAb34g65DH_2w3UhJoYZFxEDJHfUGdbDJOPAGlm10Wx3fl8Ojc85EOZgSwsrKdXq8vAq97wbp1f-l_BPeSI1X</recordid><startdate>20200507</startdate><enddate>20200507</enddate><creator>Mir, Zara S.</creator><creator>Lewis, Thomas R.</creator><creator>Onel, Lavinia</creator><creator>Blitz, Mark A.</creator><creator>Seakins, Paul W.</creator><creator>Stone, Daniel</creator><general>Royal Soc Chemistry</general><general>Royal Society of Chemistry</general><scope>AOWDO</scope><scope>BLEPL</scope><scope>DTL</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-0637-9141</orcidid><orcidid>https://orcid.org/0000-0002-4335-8593</orcidid></search><sort><creationdate>20200507</creationdate><title>CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure</title><author>Mir, Zara S. ; Lewis, Thomas R. ; Onel, Lavinia ; Blitz, Mark A. ; Seakins, Paul W. ; Stone, Daniel</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-g289t-82519645a3b6063f2cb7082743fd8565f0d8eb48caa223dfaeeb6b91f4f649c93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Absorption cross sections</topic><topic>Broadband</topic><topic>Chemistry</topic><topic>Chemistry, Physical</topic><topic>Flash photolysis</topic><topic>Gas mixtures</topic><topic>Physical Sciences</topic><topic>Physics</topic><topic>Physics, Atomic, Molecular & Chemical</topic><topic>Pressure dependence</topic><topic>Pulsed lasers</topic><topic>Reaction kinetics</topic><topic>Science & Technology</topic><topic>Ultraviolet radiation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mir, Zara S.</creatorcontrib><creatorcontrib>Lewis, Thomas R.</creatorcontrib><creatorcontrib>Onel, Lavinia</creatorcontrib><creatorcontrib>Blitz, Mark A.</creatorcontrib><creatorcontrib>Seakins, Paul W.</creatorcontrib><creatorcontrib>Stone, Daniel</creatorcontrib><collection>Web of Science - Science Citation Index Expanded - 2020</collection><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Physical chemistry chemical physics : PCCP</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mir, Zara S.</au><au>Lewis, Thomas R.</au><au>Onel, Lavinia</au><au>Blitz, Mark A.</au><au>Seakins, Paul W.</au><au>Stone, Daniel</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure</atitle><jtitle>Physical chemistry chemical physics : PCCP</jtitle><stitle>PHYS CHEM CHEM PHYS</stitle><date>2020-05-07</date><risdate>2020</risdate><volume>22</volume><issue>17</issue><spage>9448</spage><epage>9459</epage><pages>9448-9459</pages><issn>1463-9076</issn><eissn>1463-9084</eissn><abstract>The UV absorption cross-sections of the Criegee intermediate CH2OO, and kinetics of the CH2OO self-reaction and the reaction of CH2OO with I are reported as a function of pressure at 298 K. Measurements were made using pulsed laser flash photolysis of CH2I2/O-2/N-2 gas mixtures coupled with time-resolved broadband UV absorption spectroscopy at pressures between 6 and 300 Torr. Results give a peak absorption cross-section of (1.37 +/- 0.29) x 10(-17) cm(2) at similar to 340 nm and a rate coefficient for the CH2OO self-reaction of (8.0 +/- 1.1) x 10(-11) cm(3) s(-1), with no significant pressure dependence of the absorption cross-sections or the self-reaction kinetics over the range investigated. The rate coefficient for the reaction between CH2OO and I demonstrates pressure dependence over the range investigated, with a Lindemann fit giving k(0) = (4.4 +/- 1.0) x 10(-29) cm(6) s(-1) and k(infinity) = (6.7 +/- 0.6) x 10(-11) cm(3) s(-1). The origins of IO in the system have been investigated, the implications of which are discussed.</abstract><cop>CAMBRIDGE</cop><pub>Royal Soc Chemistry</pub><pmid>32314758</pmid><doi>10.1039/d0cp00988a</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-0637-9141</orcidid><orcidid>https://orcid.org/0000-0002-4335-8593</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Absorption cross sections Broadband Chemistry Chemistry, Physical Flash photolysis Gas mixtures Physical Sciences Physics Physics, Atomic, Molecular & Chemical Pressure dependence Pulsed lasers Reaction kinetics Science & Technology Ultraviolet radiation |
| title | CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure |
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