Mid-infrared Laser Spectroscopy of Jet-Cooled Formic Acid Trimer: Mode-Dependent Line Broadening in the C-O Stretching Region.

ABSTRACT: Building on recent progress in the vibrational spectroscopy of the formic acid trimer, we present the first high-resolution measurements of the jet-cooled laser absorption spectrum of (HCOOH)₃. The spectra of the lowest- and highest-frequency C-O stretching fundamentals are analyzed whereas the third band is not observed, complicated by monomer and dimer absorptions at 1219 cm^-1 (8.2 μm). Vibration-rotation parameters are obtained for the band at 1172.31512(68) cm^-1 whereas the C-O stretch at 1246.33(5) cm^-1 exhibits a significantly larger breadth, allowing only resolution of the coarse PQR structure. Vibrational predissociation can be ruled out, and intramolecular vibrational redistribution mechanisms are discussed, particularly coupling

SUBMITTER: Nejad A 

PROVIDER: S-EPMC10786437 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature