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Thioformic acid (TFA) is the sulfur analog of formic acid, the simplestorganic acid. It has three analogues HCOSH, HCSOH, and HCSSH, each of themhaving two rotational isomeric (rotameric) forms: trans and cis where the transform is energetically more stable. In this article, we study computationalenergetics and anharmonic vibrational spectrum of TFA including overtone andcombination vibrations. We also studied experimental photoisomerization andphotodecomposition channels of HCOSH molecules with different wavelengths. Wesuggest that TFA is a potential sulfur containing candidate molecule forinterstellar and planetary observations and discuss these in a light ofdifferent radiation environments in space. More generally, we discuss thatinfrared radiation driven photo-isomerization reactions may be a commonphenomenon in such environments and can affect the chemical reaction pathwaysof organic and other interstellar molecules.

astrophysical journal/the astrophysical journal

Anharmonic Vibrational Spectrum and Experimental Matrix Isolation Study  of Thioformic Acid Conformers -- Potential Candidates for Molecular Cloud and  Solar System Observations?