Structural change of heavy water by laser-induced plasma generation

Stimulated Raman scattering (SRS) of -OD stretching vibration has been stud ied when laser-induced plasma is formed in heavy water by focusing an inten se picosecond pulsed Nd:YAG laser beam (wavelength 532 nm, pulse duration 8 0 ps) at room temperature. The main peak of the SRS shows a remarkable blue shift and an asymmetric intensity distribution. The Raman shift and active modes of the SRS indicate that the ice VU. structure is formed and lasts 2 0-30 ps in the focal volume of the pumping beam in heavy water. (C) 1999 El sevier Science B.V. All rights reserved.