PROPERTIES OF H-2 UNDER STRONG COMPRESSION IN A NE MATRIX

The vibron frequencies of H-2 and D2 molecules compressed in a Ne matrix have been measured up to 45 GPa in a diamond-anvil cell. This evolution with pressure is seen to be very different from that measured previously in pure H-2 and D2 solids: The vibron frequency displays a strong monotonic increase with pressure. The effect of pressure on the bond length of the isotopic H-2 molecules is then extracted from the Raman data with two analyses: A strong decrease is shown.