Chemical Physics Letters, Vol.694, 35-39, 2018
The He-2-OCS complex: Comparison between theory and experiment
OCS is an ideal probe for quantum solvation effects in cold helium clusters. He-2-OCS is the "second step" in going from a single OCS molecule to a large doped superfluid helium cluster. Here assignment of the spectrum of He-2-OCS is significantly extended to higher values of J, K, and v(t) (the low frequency torsional vibration). The observation of a new infrared band, OCS nu(1) + nu(3), taken together with the known nu(1) band, enables assignments to be verified by comparing ground state combination differences. Relatively straightforward scaling of previously calculated theoretical energy levels gives a remarkably good fit to experiment. (C) 2018 Elsevier B.V. All rights reserved.