Abstract
The recent reaction surface Hamiltonian model for the double proton tunneling in formic acid dimer of Barnes et al. [G.L. Barnes, S.M. Squires, E.L. Sibert, J. Phys. Chem. B. 112 (2008) 595.] has been applied to the calculation of the symmetric OH stretching Raman spectra. We interpret the full Raman spectra obtained through use of a simplified, single minimum spectrum. Extensive state mixing is found, leading to broad spectral features. Results compare well with the experimental measurements of Bertie et al. [J.E. Bertie, K.H. Michaelian, H.H. Eysel, D. Hager, J. Chem. Phys. 85 (9) (1986) 4779]. We also report improvements upon our previous approach and present ground state and fundamental frequencies as well as tunneling splittings obtained with our new method.
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