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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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Article information


Submitted
11 Sep 2015
Accepted
22 Oct 2015
First published
23 Oct 2015

Phys. Chem. Chem. Phys., 2015,17, 30648-30658
Article type
Paper
Author version available

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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