Further studies on the collision-induced absorption of the fundamental band of hydrogen at room temperature

Abstract

The collision-induced infrared absorption of the fundamental band of hydrogen in H₂–O₂ and H₂–Xe mixtures was studied at room temperature at a path length of 105.2 cm at pressures up to 250 atm for different base pressures of hydrogen. The enhancement absorption profiles of the band in H₂–O₂ mixtures show the usual features of collision-induced absorption. However, the enhancement profiles in H₂–Xe mixtures show some interesting new features. These are: the separation between the peaks of the two components of the Q branch remains almost constant with increasing density of the mixture; at all densities, the intensities of these two peaks are almost equal; and the lines of the quadrupolar branches O and S are more pronounced than those in any other binary mixture of hydrogen studied previously. Integrated absorption coefficients were measured for each of the mixtures and the binary and ternary absorption coefficients were derived. The values of the binary coefficients are 6.12 × 10⁻³⁵ cm⁶ s⁻¹ for H₂–O₂, and 11.34 × 10⁻³⁵ cm⁶ s⁻¹ for H₂–Xe. The ternary coefficient is zero for H₂–O₂, whereas it has a large negative value for H₂–Xe.