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Issue 45, 2015
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Radiation-induced transformations of matrix-isolated formic acid: evidence for the HCOOH → HOCO + H channel

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Abstract

The effect of X-ray irradiation on the isolated formic acid molecules (HCOOH) in solid noble gas matrices (Xe, Kr, Ar, and Ne) at very low temperatures (6 K) was first studied by FTIR spectroscopy. Carbon oxides (CO and CO2) and hydrocarboxyl radicals (HOCO) have been detected as the principal degradation products. The formation of HOCO radicals represents a primary dissociation channel for formic acid, which was not reported previously under UV photolysis in solids. This reaction can be explained by the involvement of the recombination-induced excited states, which are not populated in photolysis. The effects of the matrix and the absorbed dose on the product formation were studied in detail and possible mechanisms are discussed with particular attention to the difference between radiolysis and UV-photolysis of the matrix-isolated formic acid. The results obtained provide a new insight into the effects of high-energy impact on the simplest carboxylic acid with possible implications to the astrochemical problems, in particular, the prebiotic evolution in the interstellar medium.

Graphical abstract: Radiation-induced transformations of matrix-isolated formic acid: evidence for the HCOOH → HOCO + H channel

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Publication details

The article was received on 11 Sep 2015, accepted on 22 Oct 2015 and first published on 23 Oct 2015


Article type: Paper
DOI: 10.1039/C5CP05446J
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 30648-30658
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    Radiation-induced transformations of matrix-isolated formic acid: evidence for the HCOOH → HOCO + H channel

    S. V. Ryazantsev and V. I. Feldman, Phys. Chem. Chem. Phys., 2015, 17, 30648
    DOI: 10.1039/C5CP05446J

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