title: Radiation-induced transformations of methanol molecules in low-temperature solids: a matrix isolation study.
abstract: The effect of X-ray irradiation on methanol molecules (CH3OH, CD3OH, and13CH3OH) 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 CO2were 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.
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia. feldman@rad.chem.msu.ru.
authors.forename: Elizaveta V
authors.initials: EV
authors.lastname: Saenko
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia. feldman@rad.chem.msu.ru.
authors.forename: Vladimir I
authors.initials: VI
authors.lastname: Feldman