CARS STUDY OF DEUTERIUM CLUSTERS STABILIZED IN SOLID HELIUM
Gordon E.B., Kumada T., Ishiguro M., Aratono Y.

Received: April 27, 2004

PACS: 33.20.Fb, 33.70.Jg, 67.80.Mg

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Solid deuterium clusters for the first time isolated in a matrix of solid Helium have been investigated at T=1.3 K and P=3 MPa by coherent anti-Stokes Raman spectroscopy (CARS) technique. The vibronic Q₁(J=0) and Q₁(J=1) line intensity, shape, and positions have been studied as functions of ortho- and para-content in the solid, as well as of the cluster size. The strong effect of Raman scattering cross section sensitivity to the molecular environment nuclear spin state has been found in CARS: the ratio of probabilities for the scattering by para (J=1)- and ortho (J=0)-deuterium being equal to 1 in a gas is as high as 10000 in nearly pure ortho-deuterium, whereas it is about 50 in spontaneous Raman scattering. This effect has been shown to occur starting from the cluster size corresponding to the phonon band onset.