CRYOSPECTRA OF HYDROGEN DEUTERIDE DISSOLVED IN LIQUID NEON: NEW EFFECTS AND THEIR INTERPRETATION.

A.P.KOUZOV

New data have been recently obtained at the University of Antwerp on the fundamental absorption band of HD in liquid neon at different temperatures (T=25-45K) and concentrations (HD m.f.=1-10 %). The talk aims at the qualitative interpretation of these data.

Mostly, the observed absorption appears because of the guest-host interactions. A simple shape model is proposed to fit the central diffuse doublet band which is due to the rattling HD motion in a cage formed by surrounding Ne atoms. A striking antiresonance sharp feature is observed near the allowed R1(0) transition, which is a result of anticorrelation between the HD intrinsic dipole moment and its collision-induced counterpart. The antiresonance dip is separated from the background rattling-mode intensity and analyzed on the basis of the Fano-Mori theory.

The intensity of the central sharp line is mostly induced by the guest-guest interaction. Strikingly, the line is considerably narrowed as the HD molar fraction is increased.




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