Vibrational Overtone Absorption in Solid Hydrogen

Abstract

The first measurements of the second-overtone absorption spectrum of solid $n$-${\mathrm{H}}_{2}$ are reported. The observed frequencies and line strengths are not predicted from the known high-pressure gas data, but the trend is consistent with similar data for the fundamental band. The observation of this very weak optical absorption provides important data for reexamination and extension of theoretical treatment of this important molecular solid.