Abstract

The absorption coefficient of SO₂ under atmospheric conditions was measured at twenty DF laser lines. Weak absorption (α* ≲ 0.003 cm⁻¹ atm⁻¹) was found for a few wavelengths around 3.7 μm. Only the P₄(6) line at 3.9843 μm (ν = 2509.86 cm⁻¹) is strongly absorbed [α* = (0.44 ± 0.01) cm⁻¹ atm⁻¹]. The pressure dependence of the P₄(6) cross section was measured. Self-broadening and foreign-gas broadening coefficients are between 1.5 and 5 MHz/Torr, and the distance from the P₄(6) DF line to the center of the nearest SO₂ line is (0.0043 ± 0.0004) cm⁻¹.

© 1980 Optical Society of America

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