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Issue 47, 2016
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Radiation-induced transformations of methanol molecules in low-temperature solids: a matrix isolation study

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Abstract

The effect of X-ray irradiation on methanol molecules (CH3OH, CD3OH, and 13CH3OH) isolated in solid noble gas matrices (Ne, Ar, Kr, and Xe) was studied by FTIR spectroscopy at 6 K. CH2OH˙, H2CO, HCO˙ and CO were found to be the main degradation products. Somewhat unexpectedly, the production of CO is quite prominent, even at low doses, and it strongly predominates in low-polarizable matrices (especially, in neon). This result is explained by inefficient quenching of excess energy in the H2CO molecules initially generated from methanol. Relatively small amounts of CH4, CH3˙ and CO2 were also observed directly after irradiation. The latter species presumably originates from methanol dimers or methanol–water complexes. The mechanisms of radiolysis and annealing-induced reactions are discussed and possible implications for the astrochemically relevant ices are considered.

Graphical abstract: Radiation-induced transformations of methanol molecules in low-temperature solids: a matrix isolation study

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Publication details

The article was received on 02 Sep 2016, accepted on 28 Oct 2016 and first published on 07 Nov 2016


Article type: Paper
DOI: 10.1039/C6CP06082J
Citation: Phys. Chem. Chem. Phys., 2016,18, 32503-32513
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    Radiation-induced transformations of methanol molecules in low-temperature solids: a matrix isolation study

    E. V. Saenko and V. I. Feldman, Phys. Chem. Chem. Phys., 2016, 18, 32503
    DOI: 10.1039/C6CP06082J

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