@article {6440, title = {First-principles prediction of the Raman shifts in parahydrogen clusters}, journal = {Journal of Chemical Physics}, volume = {141}, year = {2014}, pages = {014310}, abstract = {

We report a first-principles prediction of the Raman shifts of parahydrogen (pH2)\ clusters\ of sizes\ N\ = 4{\textendash}19 and 33, based on path integral\ ground-statesimulations with an\ ab initio\ potential energy surface.\ The Raman shifts are calculated, using perturbation theory, as the average of the difference-potential energy\ surface\ between the\ potential energy surfaces\ for vibrationally excited and\ ground-state\ parahydrogen\ monomers.\ The radial distribution of the\ clusters\ is used as a weight function in this average. Very good overall agreement with experiment [G. Tejeda, J. M. Fern{\'a}ndez, S. Montero, D. Blume, and J. P. Toennies,\ Phys. Rev. Lett.\ 92, 223401 (2004)] is achieved for\ p(H2)2-8,13,33. A number of different pair potentials are employed for the calculation of the radial\ distribution functions.\ We find that the Raman shifts are sensitive to slight variations in the radial\ distribution functions.

}, author = {Nabil Faruk and Matthew Schmidt and Hui Li and Robert J. Le Roy and Pierre-Nicholas Roy} }