Thioformic acid (TFA) is the sulfur analog of formic acid, simplest organic acid. It has three analogues HCOSH, HCSOH, and HCSSH, each them having two rotational isomeric (rotameric) forms: trans cis where form energetically more stable. In this article, we study computational energetics anharmonic vibrational spectrum TFA including overtone combination vibrations. We also studied experimental ...
