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iGVPT2 is a program for computing anharmonic corrections to vibrationfrequencies, based on force field expansion of the potential energy surface innormal mode coordinates. It includes second order vibrational perturbationtheory (VPT2) algorithm and its derived methods (VPT2+K, DCPT2, HDCPT2). iGVPT2is interfaced with several computation chemistry packages to compute thepotential energies and dipoles derivatives. The second, third and quarticderivatives can be computed at the same level of theory but they can be alsocomputed using different methods via one or two computational packages. iGPVT2includes also a very fast hybrid QM//MM approach for biomolecules. It isprovided free-of-charge for non-commercial research (see\url{https://sites.google.com/site/allouchear/igvpt2}).

iGVPT2 : an interface to computational chemistry packages for anharmonic corrections to vibrational frequencies