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Conformers of formic acid (HCOOH, FA). (a) trans and cis monomers. (b) trans-trans and trans-cis dimers considered in the present work. The notation of the trans and cis geometries follows Refs. 5–7.
(a) (from top to bottom) IR spectrum of as-deposited FA/Ne sample with trans-FA monomers (tM) and trans-trans dimers (ttD), the result of pumping at when cis-FA monomer (cM) appears, and the result of pumping at when trans-cis dimer (tcD) appears. The two lower spectra are difference spectra. The spectra were measured with resolution of at . (b) Reactive vibrational excitation (RVE) spectra displaying the efficiency of formation of cM and tcD. The geometries are shown in Fig. 1.
(a) Decays of cis-FA monomer in solid neon and argon and trans-cis FA dimer in solid neon. The data were obtained at . The decay time of cis-FA in solid neon was measured with an accuracy of . The initial concentrations are normalized. (b) Decay rate constants for cis-FA monomer and trans-cis dimer in solid neon and argon. The symbols are explained in the panel. The data points shown with open symbols are from Ref. 13.
Characteristic absorption bands of trans-FA monomer (tM), cis-FA monomer (cM), trans-trans dimer (ttD), and trans-cis dimer (tcD) in solid neon and literature data for cM and tcD in solid argon.
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