Quantifying the photoionization cross section of the hydroxyl radical
The hydroxyl free radical, OH, is one of the most important radicals in atmospheric and interstellar chemistry, and its cation plays a role in the reactions leading to H2O formation. Knowledge of the photoionization efficiency of the OH radical is crucial to properly model the water photochemical cy...
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| Veröffentlicht in: | The Journal of chemical physics 2019-04, Vol.150 (14), p.141103-141103 |
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| container_title | The Journal of chemical physics |
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| creator | Harper, O. J. Hassenfratz, M. Loison, J.-C. Garcia, G. A. de Oliveira, N. Hrodmarsson, H.R. Pratt, S. T. Boyé-Péronne, S. Gans, B. |
| description | The hydroxyl free radical, OH, is one of the most important radicals in atmospheric and interstellar chemistry, and its cation plays a role in the reactions leading to H2O formation. Knowledge of the photoionization efficiency of the OH radical is crucial to properly model the water photochemical cycle of atmospheres and astrophysical objects. Using a gas-phase radical source based on a single H-abstraction reaction combined with a photoelectron/photoion imaging coincidence spectrometer coupled with synchrotron radiation, we recorded the OH+ photoion yield over the 12.6–15 eV energy range, and we set it to an absolute cross section scale using an absolute point measurement performed at 13.8 eV: σOHion=9.0±2.7 Mb. The resulting cross section values differ by approximately a factor 2 from the recent measurement of Dodson et al. [J. Chem. Phys. 148, 184302 (2018)] performed with a different radical source, which is somewhat greater than the combined uncertainties of the measurements. This finding underlines the need for further investigations of this cross section. |
| doi_str_mv | 10.1063/1.5091966 |
| format | Article |
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J. ; Hassenfratz, M. ; Loison, J.-C. ; Garcia, G. A. ; de Oliveira, N. ; Hrodmarsson, H.R. ; Pratt, S. T. ; Boyé-Péronne, S. ; Gans, B.</creator><creatorcontrib>Harper, O. J. ; Hassenfratz, M. ; Loison, J.-C. ; Garcia, G. A. ; de Oliveira, N. ; Hrodmarsson, H.R. ; Pratt, S. T. ; Boyé-Péronne, S. ; Gans, B.</creatorcontrib><description>The hydroxyl free radical, OH, is one of the most important radicals in atmospheric and interstellar chemistry, and its cation plays a role in the reactions leading to H2O formation. Knowledge of the photoionization efficiency of the OH radical is crucial to properly model the water photochemical cycle of atmospheres and astrophysical objects. Using a gas-phase radical source based on a single H-abstraction reaction combined with a photoelectron/photoion imaging coincidence spectrometer coupled with synchrotron radiation, we recorded the OH+ photoion yield over the 12.6–15 eV energy range, and we set it to an absolute cross section scale using an absolute point measurement performed at 13.8 eV: σOHion=9.0±2.7 Mb. The resulting cross section values differ by approximately a factor 2 from the recent measurement of Dodson et al. [J. Chem. Phys. 148, 184302 (2018)] performed with a different radical source, which is somewhat greater than the combined uncertainties of the measurements. This finding underlines the need for further investigations of this cross section.</description><identifier>ISSN: 0021-9606</identifier><identifier>EISSN: 1089-7690</identifier><identifier>DOI: 10.1063/1.5091966</identifier><identifier>PMID: 30981250</identifier><identifier>CODEN: JCPSA6</identifier><language>eng</language><publisher>United States: American Institute of Physics</publisher><subject>Cross-sections ; Free radicals ; Hydroxyl radicals ; Interstellar chemistry ; Organic chemistry ; Photoelectrons ; Photoionization ; Physics ; Synchrotron radiation</subject><ispartof>The Journal of chemical physics, 2019-04, Vol.150 (14), p.141103-141103</ispartof><rights>Author(s)</rights><rights>2019 Author(s). 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Using a gas-phase radical source based on a single H-abstraction reaction combined with a photoelectron/photoion imaging coincidence spectrometer coupled with synchrotron radiation, we recorded the OH+ photoion yield over the 12.6–15 eV energy range, and we set it to an absolute cross section scale using an absolute point measurement performed at 13.8 eV: σOHion=9.0±2.7 Mb. The resulting cross section values differ by approximately a factor 2 from the recent measurement of Dodson et al. [J. Chem. Phys. 148, 184302 (2018)] performed with a different radical source, which is somewhat greater than the combined uncertainties of the measurements. 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T.</au><au>Boyé-Péronne, S.</au><au>Gans, B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Quantifying the photoionization cross section of the hydroxyl radical</atitle><jtitle>The Journal of chemical physics</jtitle><addtitle>J Chem Phys</addtitle><date>2019-04-14</date><risdate>2019</risdate><volume>150</volume><issue>14</issue><spage>141103</spage><epage>141103</epage><pages>141103-141103</pages><issn>0021-9606</issn><eissn>1089-7690</eissn><coden>JCPSA6</coden><abstract>The hydroxyl free radical, OH, is one of the most important radicals in atmospheric and interstellar chemistry, and its cation plays a role in the reactions leading to H2O formation. Knowledge of the photoionization efficiency of the OH radical is crucial to properly model the water photochemical cycle of atmospheres and astrophysical objects. 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| subjects | Cross-sections Free radicals Hydroxyl radicals Interstellar chemistry Organic chemistry Photoelectrons Photoionization Physics Synchrotron radiation |
| title | Quantifying the photoionization cross section of the hydroxyl radical |
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