Diode laser measurements of strengths, half-widths, and temperature dependence of half-widths for CO 2 spectral lines near 4.2 μm

Absolute line strengths have been measured at room temperature for spectral lines in the R branch of the ν₃ band of ¹²C ¹⁶O ₂, ¹²C ¹⁶O ¹⁸O, and ¹²C ¹⁶O ¹⁷O and the ( ν₂ + ν₃) - ν₂ and ( ν₁ + ν₃) - ν₁ bands of ¹²C ¹⁶O ₂ in the region 2365-2393 cm ^-1 using a tunable diode laser spectrometer; from these measurements band strengths have been computed. Self- and nitrogen-broadened half-widths have been measured for some ν₃ lines of ¹²C ¹⁶O ₂ and ¹²C ¹⁶O ¹⁷O, and nitrogen-broadened half-widths measured for some ( ν₂ + ν₃) - ν₂ band lines of ¹²C ¹⁶O ₂. From measurements made over a temperature range from 217 to 299 K we have obtained temperature coefficients n, for the N ₂-broadened Lorentz half-width defined as b _L⁰(T) = b _L⁰(T ₀)( {T}/{T ₀}) ^-n, for the ν₃ and ( ν₂ + ν₃) - ν₂ bands of ¹²C ¹⁶O ₂. They are 0.757 ± 0.008 and 0.789 ± 0.015, respectively.