O(3PJ) Formation and Desorption by 157-nm Photoirradiation of Amorphous Solid Water

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dc.contributor.author DeSimone, Alice J.
dc.contributor.author Orlando, Thomas M.
dc.date.accessioned 2018-10-24T13:59:22Z
dc.date.available 2018-10-24T13:59:22Z
dc.date.issued 2014-03-06
dc.identifier.citation DeSimone, A., Orlando, T. (2014): O(3PJ) Formation and Desorption by 157-nm Photoirradiation of Amorphous Solid Water. The Journal of Chemical Physics, 140. DOI: https://doi.org/10.1063/1.4867194 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/4094
dc.description.abstract Photodissociation of amorphous solid water (ASW) deposited on a thinly oxidized copper substrate at 82 K was studied by measuring O(3PJ=2,1,0) photoproducts detected with resonance-enhanced multiphoton ionization. For each spin-orbit state, the oxygen atom time-of-flight spectrum was measured as a function of H2O exposure, which is related to ice thickness, and 157-nm irradiation time. Four Maxwell-Boltzmann distributions with translational temperatures of 10 000 K, 1800 K, 400 K, and 82 K were found to fit the data. The most likely formation mechanisms are molecular elimination following ionization of water and ion-electron recombination, secondary recombination of hydroxyl radicals, and photodissociation of adsorbed hydroxyl radicals. Evidence for O-atom diffusion through bulk ASW was found for H2O exposures of at least 5 Langmuir (1 L = 10−6 Torr s). The cross sections for O(3P2) depletion were 1.3 × 10−19 and 6.5 × 10−20 cm2 for 1 and 5 L, respectively. Original article: JCP: BioChemical Physics 8 (3), 03B603_1 (2014) en_US
dc.format.mimetype application/pdf en_US
dc.subject Amorphous solids en_US
dc.subject Photodissociation en_US
dc.subject Recombination reactions en_US
dc.subject Transition metals en_US
dc.subject Resonance-enhanced multiphoton ionization en_US
dc.subject Chemical elements en_US
dc.subject Gas phase en_US
dc.subject Surface and interface chemistry en_US
dc.subject Saturnian satellites en_US
dc.subject Photodesorption en_US
dc.title O(3PJ) Formation and Desorption by 157-nm Photoirradiation of Amorphous Solid Water en_US
dc.type text en_US


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