Pressure-induced infrared absorption of the fundamental band of hydrogen in H2–Ne and H2–Kr mixtures at room temperature

Abstract

The pressure-induced infrared absorption of the fundamental band of hydrogen in H₂–Ne and H₂–Kr mixtures was studied at room temperature at a path length of 25.8 cm at pressures up to 400 atmospheres for different base pressures of hydrogen. In the enhancement absorption profiles of the band in H₂–Ne mixtures, the S(1) line at all pressures and the Q_P component at low pressures show doublet structures. In the enhancement contours in H₂–Kr mixtures, there is an indication of the Q_Q component between the Q_P and Q_R maxima at higher pressures, and the O and S lines are much stronger than the corresponding lines in H₂–Ne mixtures. Integrated absorption coefficients were measured for each of the mixtures studied, and the binary and ternary absorption coefficients were derived. The values of the binary coefficients are 2.37 × 10⁻³⁵ cm⁶ s⁻¹ for H₂–Ne and 7.56 × 10⁻³⁵ cm⁶ s⁻¹ for H₂–Kr.