Centroid molecular dynamics (CMD) and ring polymer molecular dynamics (RPMD) are two conceptually distinct extensions of path integral molecular dynamics that are able to generate approximate quantum dynamics of complex molecular systems. Both methods can be used to compute quasiclassical time correlation functions which have direct application in molecular spectroscopy; in particular, to infrared spectroscopy via dipole autocorrelation functions. The performance of both methods for computing vibrational spectra of several simple but representative molecular model systems is investigated systematically as a function of temperature and isotopic substitution. In this context both CMD and RPMD feature intrinsic problems which are quantified and investigated in detail. Based on the obtained results guidelines for using CMD and RPMD to compute infrared spectra of molecular systems are provided.
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21 May 2009
Research Article|
May 19 2009
On the applicability of centroid and ring polymer path integral molecular dynamics for vibrational spectroscopy
Dominik Marx
Dominik Marx
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Electronic mail: sergei.ivanov@theochem.rub.de.
b)
Present address: Center for Promotion of Computational Science and E–Systems, Japan Atomic Energy Agency, 6-9-3, Higashi-Ueno, Taito-ku, Tokyo 110-0015, Japan.
J. Chem. Phys. 130, 194510 (2009)
Article history
Received:
October 28 2008
Accepted:
April 07 2009
Citation
Alexander Witt, Sergei D. Ivanov, Motoyuki Shiga, Harald Forbert, Dominik Marx; On the applicability of centroid and ring polymer path integral molecular dynamics for vibrational spectroscopy. J. Chem. Phys. 21 May 2009; 130 (19): 194510. https://doi.org/10.1063/1.3125009
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