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The recently introduced mixed time-averaging semiclassical initial valuerepresentation molecular dynamics method for spectroscopic calculations [M.Buchholz, F. Grossmann, and M. Ceotto, J. Chem. Phys. 144, 094102 (2016)] isapplied to systems with up to 61 dimensions, ruled by a condensed phaseCaldeira-Leggett model potential. By calculating the ground state as well asthe first few excited states of the system Morse oscillator, changes of boththe harmonic frequency and the anharmonicity are determined. The methodfaithfully reproduces blueshift and redshift effects and the importance of thecounter term, as previously suggested by other methods. Differently fromprevious methods, the present semiclassical method does not take advantage ofthe specific form of the potential and it can represent a practical tool thatopens the route to direct ab initio semiclassical simulation of condensed phasesystems.

Application of the Mixed Time-averaging Semiclassical Initial Value Representation method to Complex Molecular Spectra