Broadening of hydrogen fluoride lines by H2, D2, and N2

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Abstract
Foreign gas broadening of the vibration‐rotation lines in the first overtone band of hydrogen fluoride have been investigated. Linewidths broadened by N2, H2, and D2 have been measured for 15 lines in the band at a resolution of approximately 0.1 cm−1. Comparison of the measured widths with predictions based on the Anderson theory show good agreement only for N2 broadening of the lower J transitions. Theory overpredicts all H2 broadened widths and all D2 broadened widths except those for the R(0), P(1), and P(2) lines for the Anderson treatment of close collisions. Better agreement is found with H2 broadening if the Van‐Kranendonk treatment of close collisions is used. The general conclusion reached is that the theory cannot be used reliably to predict vibration‐rotation linewidths which are dominated by forces of shorter range than dipole‐dipole.

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