Absorption coefficients for hydrogen—II. Calculated pressure-induced H2–H2 vibrational absorption in the fundamental region |
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Authors: | RW Patch |
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Institution: | Lewis Research Center, Cleveland, Ohio 44135, USA |
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Abstract: | The coefficient for pressure-induced vibrational absorption in H2ndash;H2 collisions was calculated for temperatures from 298 to 7000°K and wave numbers between 100 and 40,000 cm−1 for local thermodynamic equilibrium. Because only transitions with a net change of +1 vibrational quanta were considered, the absorption was centered near the fundamental at 4161 cm−1 in the infrared. The model included electronic configuration interaction, mechanical anharmonicity, vibration-rotation interaction, excited vibrational states, and more realistic intermolecular potential and line shapes than previously used. The integrated absorption coefficient at 3000°K was 2.1 times the previous theoretical value. An approximate formula for the absorption coefficient is given for rapid calculation. |
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