THE PRESSURE-INDUCED ROTATIONAL ABSORPTION SPECTRUM OF HYDROGEN: II. ANALYSIS OF THE ABSORPTION PROFILES

Abstract

The experimental profiles obtained in Part I for the pressure-induced absorption of H₂ and H₂ – foreign gas mixtures in the region 300–1400 cm⁻¹ are separated by a semiempirical method into rotational and translational parts. The pressure-induced rotational lines of H₂ are shown to have a dispersion line shape, modified by the Boltzmann law. The intensities of the rotational parts of the spectra are, on the average, 13% greater than those calculated in Part I on the assumption of quadrupole interaction alone; the residual experimental intensity probably represents the effect of overlap interaction. The intensities of the translational parts of the spectra are of the same order of magnitude as the translational intensities in mixtures of the rare gases. Some additional experimental data on double rotational transitions and on the anomalous density variation of the absorption in H₂–Xe mixtures are given.