Influence of ice structure on the soft UV photochemistry of PAHs embedded in solid water
Context. The UV photoreactivity of polycyclic aromatic hydrocarbons (PAHs) in porous amorphous solid water has long been known to form both oxygenated photoproducts and photofragments. Aims. The aim of this study is to examine the influence of ice structure on reactivity under soft UV irradiation co...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2020-12, Vol.644, p.A22 |
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| container_title | Astronomy and astrophysics (Berlin) |
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| creator | Noble, J. A. Michoulier, E. Aupetit, C. Mascetti, J. |
| description | Context.
The UV photoreactivity of polycyclic aromatic hydrocarbons (PAHs) in porous amorphous solid water has long been known to form both oxygenated photoproducts and photofragments.
Aims.
The aim of this study is to examine the influence of ice structure on reactivity under soft UV irradiation conditions.
Methods.
Mixtures of PAHs with amorphous solid water (porous and compact) and crystalline (cubic and hexagonal) ices were prepared in a high vacuum chamber and irradiated using a mercury lamp for up to 2.5 h.
Results.
The results show that the production of oxygenated PAHs is efficient only in amorphous water ice, while fragmentation can occur in both amorphous and crystalline ices. We conclude that the reactivity is driven by PAH–water interactions in favourable geometries, notably where dangling bonds are available at the surface of pores.
Conclusions.
These results suggest that the formation of oxygenated PAH molecules is most likely to occur in interstellar environments with porous (or compact) amorphous solid water and that this reactivity could considerably influence the inventory of aromatics in meteorites. |
| doi_str_mv | 10.1051/0004-6361/202038568 |
| format | Article |
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The UV photoreactivity of polycyclic aromatic hydrocarbons (PAHs) in porous amorphous solid water has long been known to form both oxygenated photoproducts and photofragments.
Aims.
The aim of this study is to examine the influence of ice structure on reactivity under soft UV irradiation conditions.
Methods.
Mixtures of PAHs with amorphous solid water (porous and compact) and crystalline (cubic and hexagonal) ices were prepared in a high vacuum chamber and irradiated using a mercury lamp for up to 2.5 h.
Results.
The results show that the production of oxygenated PAHs is efficient only in amorphous water ice, while fragmentation can occur in both amorphous and crystalline ices. We conclude that the reactivity is driven by PAH–water interactions in favourable geometries, notably where dangling bonds are available at the surface of pores.
Conclusions.
These results suggest that the formation of oxygenated PAH molecules is most likely to occur in interstellar environments with porous (or compact) amorphous solid water and that this reactivity could considerably influence the inventory of aromatics in meteorites.</description><identifier>ISSN: 0004-6361</identifier><identifier>EISSN: 1432-0746</identifier><identifier>EISSN: 1432-0756</identifier><identifier>DOI: 10.1051/0004-6361/202038568</identifier><language>eng</language><publisher>Heidelberg: EDP Sciences</publisher><subject>Astrophysics ; Crystal structure ; Crystallinity ; High vacuum ; Interstellar chemistry ; Irradiation ; Mercury lamps ; Meteorites ; Oxygenation ; Photochemistry ; Physics ; Polycyclic aromatic hydrocarbons ; Reactivity ; Ultraviolet radiation ; Vacuum chambers</subject><ispartof>Astronomy and astrophysics (Berlin), 2020-12, Vol.644, p.A22</ispartof><rights>2020. This work is licensed under https://creativecommons.org/licenses/by/4.0 (the “License”). Notwithstanding the ProQuest Terms and conditions, you may use this content in accordance with the terms of the License.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c422t-5f350fe45f5efe46317b980a94fabeb087181da099e28fdc1a63957406add2fb3</citedby><cites>FETCH-LOGICAL-c422t-5f350fe45f5efe46317b980a94fabeb087181da099e28fdc1a63957406add2fb3</cites><orcidid>0000-0002-8585-9118 ; 0000-0003-4985-8254</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,3714,27903,27904</link.rule.ids><backlink>$$Uhttps://hal.science/hal-03022873$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Noble, J. A.</creatorcontrib><creatorcontrib>Michoulier, E.</creatorcontrib><creatorcontrib>Aupetit, C.</creatorcontrib><creatorcontrib>Mascetti, J.</creatorcontrib><title>Influence of ice structure on the soft UV photochemistry of PAHs embedded in solid water</title><title>Astronomy and astrophysics (Berlin)</title><description>Context.
The UV photoreactivity of polycyclic aromatic hydrocarbons (PAHs) in porous amorphous solid water has long been known to form both oxygenated photoproducts and photofragments.
Aims.
The aim of this study is to examine the influence of ice structure on reactivity under soft UV irradiation conditions.
Methods.
Mixtures of PAHs with amorphous solid water (porous and compact) and crystalline (cubic and hexagonal) ices were prepared in a high vacuum chamber and irradiated using a mercury lamp for up to 2.5 h.
Results.
The results show that the production of oxygenated PAHs is efficient only in amorphous water ice, while fragmentation can occur in both amorphous and crystalline ices. We conclude that the reactivity is driven by PAH–water interactions in favourable geometries, notably where dangling bonds are available at the surface of pores.
Conclusions.
These results suggest that the formation of oxygenated PAH molecules is most likely to occur in interstellar environments with porous (or compact) amorphous solid water and that this reactivity could considerably influence the inventory of aromatics in meteorites.</description><subject>Astrophysics</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>High vacuum</subject><subject>Interstellar chemistry</subject><subject>Irradiation</subject><subject>Mercury lamps</subject><subject>Meteorites</subject><subject>Oxygenation</subject><subject>Photochemistry</subject><subject>Physics</subject><subject>Polycyclic aromatic hydrocarbons</subject><subject>Reactivity</subject><subject>Ultraviolet radiation</subject><subject>Vacuum chambers</subject><issn>0004-6361</issn><issn>1432-0746</issn><issn>1432-0756</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNo9kE1LAzEQhoMoWKu_wEvAk4e1k4_NZo-lqC0U9GDFW8huEnZLu1uTrNJ_b5ZKTy_z8jAzPAjdE3gikJMZAPBMMEFmFCgwmQt5gSaEM5pBwcUlmpyJa3QTwjaNlEg2QV-rzu0G29UW9w63KUL0Qx0Hn4oOxyYVvYt484kPTR_7urH7NiHHEX-fLwO2-8oaYw1uu4TuWoN_dbT-Fl05vQv27j-naPPy_LFYZuu319Vivs5qTmnMcsdycJbnLrcpBCNFVUrQJXe6shXIgkhiNJSlpdKZmmjByrzgILQx1FVsih5Pexu9Uwff7rU_ql63ajlfq7EDBpTKgv2QxD6c2IPvvwcbotr2g-_Se4rydElIWkCi2ImqfR-Ct-68loAadatRphplqrNu9gfBu3D4</recordid><startdate>20201201</startdate><enddate>20201201</enddate><creator>Noble, J. A.</creator><creator>Michoulier, E.</creator><creator>Aupetit, C.</creator><creator>Mascetti, J.</creator><general>EDP Sciences</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-8585-9118</orcidid><orcidid>https://orcid.org/0000-0003-4985-8254</orcidid></search><sort><creationdate>20201201</creationdate><title>Influence of ice structure on the soft UV photochemistry of PAHs embedded in solid water</title><author>Noble, J. A. ; Michoulier, E. ; Aupetit, C. ; Mascetti, J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c422t-5f350fe45f5efe46317b980a94fabeb087181da099e28fdc1a63957406add2fb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Astrophysics</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>High vacuum</topic><topic>Interstellar chemistry</topic><topic>Irradiation</topic><topic>Mercury lamps</topic><topic>Meteorites</topic><topic>Oxygenation</topic><topic>Photochemistry</topic><topic>Physics</topic><topic>Polycyclic aromatic hydrocarbons</topic><topic>Reactivity</topic><topic>Ultraviolet radiation</topic><topic>Vacuum chambers</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Noble, J. A.</creatorcontrib><creatorcontrib>Michoulier, E.</creatorcontrib><creatorcontrib>Aupetit, C.</creatorcontrib><creatorcontrib>Mascetti, J.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Noble, J. A.</au><au>Michoulier, E.</au><au>Aupetit, C.</au><au>Mascetti, J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of ice structure on the soft UV photochemistry of PAHs embedded in solid water</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2020-12-01</date><risdate>2020</risdate><volume>644</volume><spage>A22</spage><pages>A22-</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><eissn>1432-0756</eissn><abstract>Context.
The UV photoreactivity of polycyclic aromatic hydrocarbons (PAHs) in porous amorphous solid water has long been known to form both oxygenated photoproducts and photofragments.
Aims.
The aim of this study is to examine the influence of ice structure on reactivity under soft UV irradiation conditions.
Methods.
Mixtures of PAHs with amorphous solid water (porous and compact) and crystalline (cubic and hexagonal) ices were prepared in a high vacuum chamber and irradiated using a mercury lamp for up to 2.5 h.
Results.
The results show that the production of oxygenated PAHs is efficient only in amorphous water ice, while fragmentation can occur in both amorphous and crystalline ices. We conclude that the reactivity is driven by PAH–water interactions in favourable geometries, notably where dangling bonds are available at the surface of pores.
Conclusions.
These results suggest that the formation of oxygenated PAH molecules is most likely to occur in interstellar environments with porous (or compact) amorphous solid water and that this reactivity could considerably influence the inventory of aromatics in meteorites.</abstract><cop>Heidelberg</cop><pub>EDP Sciences</pub><doi>10.1051/0004-6361/202038568</doi><orcidid>https://orcid.org/0000-0002-8585-9118</orcidid><orcidid>https://orcid.org/0000-0003-4985-8254</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Astronomy and astrophysics (Berlin), 2020-12, Vol.644, p.A22 |
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| source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Astrophysics Crystal structure Crystallinity High vacuum Interstellar chemistry Irradiation Mercury lamps Meteorites Oxygenation Photochemistry Physics Polycyclic aromatic hydrocarbons Reactivity Ultraviolet radiation Vacuum chambers |
| title | Influence of ice structure on the soft UV photochemistry of PAHs embedded in solid water |
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