Photodissociation of Methyl Iodide Adsorbed on Low-Temperature Amorphous Ice Surfaces

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dc.contributor.author DeSimone, Alice J.
dc.contributor.author Olanrewaju, Babajide O.
dc.contributor.author Grieves, Gregory A.
dc.contributor.author Orlando, Thomas M.
dc.date.accessioned 2018-10-24T13:47:43Z
dc.date.available 2018-10-24T13:47:43Z
dc.date.issued 2013-02-22
dc.identifier.citation DeSimone, A., Olanrewaju, B., Grieves, G., Orlando, T. (2013): Photodissociation of Methyl Iodide Adsorbed on Low-Temperature Amorphous Ice Surfaces. The Journal of Chemical Physics, 138. DOI: https://doi.org/10.1063/1.4790585 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/4092
dc.description.abstract Photodissociation dynamics of methyl iodide (CH3I) adsorbed on both amorphous solid water (ASW) and porous amorphous solid water (PASW) has been investigated. The ejected ground-state I(2P3/2) and excited-state I(2P1/2) photofragments produced by 260- and 290-nm photons were detected using laser resonance-enhanced multiphoton ionization. In contrast to gas-phase photodissociation, (i) the I(2P3/2) photofragment is favored compared to I(2P1/2) at both wavelengths, (ii) I(2P3/2) and I(2P1/2) have velocity distributions that depend upon ice morphology, and (iii) I2 is produced on ASW. The total iodine [I(2P3/2)+I(2P1/2)+I2] yield varies with substrate morphology, with greater yield from ASW than PASW using both 260- and 290-nm photons. Temperature-programmed desorption studies demonstrate that ice porosity enhances the trapping of adsorbed CH3I, while pore-free ice likely allows monomer adsorption and the formation of two-dimensional CH3I clusters. Reactions or collisions involving these clusters, I atomic fragments, or I-containing molecular fragments at the vacuum-surface interface can result in I2 formation. en_US
dc.format.mimetype application/pdf en_US
dc.subject Amorphous solids en_US
dc.subject Photodissociation en_US
dc.subject Organic compounds en_US
dc.subject Resonance-enhanced multiphoton ionization en_US
dc.subject Amorphous materials en_US
dc.subject Transition metal oxides en_US
dc.subject Chemical elements en_US
dc.subject Gas phase en_US
dc.subject Surface and interface chemistry en_US
dc.subject Temperature programmed desorption en_US
dc.title Photodissociation of Methyl Iodide Adsorbed on Low-Temperature Amorphous Ice Surfaces en_US
dc.type text en_US


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