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High resolution microwave and millimeter-wave spectra of He_N-CO clusters with N up to 10, produced in a molecular expansion, were observed. Two series of J = 1 - 0 transitions were detected, which correspond to the a-type and b-type J = 1 - 0 transitions of He-CO. The B rotational constant initially decreases with N and reaches a minimum at N = 3. Its subsequent rise indicates the transition from a molecular complex to a quantum solvated system already for N = 4. For N >= 6, the B-value becomes larger than that of He-CO, indicating an almost free rotation of CO within the helium environment. [L.A. Surin, A.V. Potapov, B.S. Dumesh, S. Schlemmer, Y. Xu, P.L.Raston, and W. Jaeger. Phys. Rev. Lett. 101, 233401 (2008)]. |
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