Toward Ab Initio Anharmonic Vibrational Circular Dichroism Spectra in the Condensed Phase
Chiara Cappelli1,2, Julien Bloino1,3, Filippo Lipparini1
1†Scuola Normale Superiore, Piazza dei Cavalieri, 7 I-56126 Pisa, Italy.
Abstract:
The first implementation and calculation of anharmonic VCD rotational strengths for solvated systems is reported. Our approach, rooted in the polarizable continuum model (PCM) and in the second-order vibrational perturbation theory (VPT2), permits not only correction for anharmonicity in the signals associated with fundamental transitions but also calculation of rotational strengths of overtones and combination bands. This allows for a more physically consistent comparison between experiment and calculations together with the analysis of spectral regions dominated by anharmonic effects. The developed model is applied to a few test cases, and the computational outcomes are directly compared with experimental data.
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