Pressure dependence of the vibron in solid hydrogen and deuterium up to 600 kbar

Abstract

We have studied the ${Q}_{1}^{+}(0)$ intramolecular vibrational transition in solid molecular hydrogen and deuterium by means of Raman scattering for pressures up to 600 kbar and temperatures down to 5 K in a diamond anvil cell. We present a semiempirical model developed to describe the pressure dependence of the transition frequency. The agreement between theory and experiment is surprisingly good up to about 200 kbar. Deviations at higher pressures cannot be explained in terms of this simple mean-field model.