Line strengths of H2O and N2O in the 1900 cm−1 region

Abstract

Measurements of line strengths of water vapor and nitrous oxide in the 1900 cm−1 region have been made with moderate spectral resolution (∼0.15 cm−1). The H2O values are, on the average, 5.5 percent (standard deviation of ±10 percent) smaller than the calculated line strengths given by Benedict and Calfee. The N2O measurements were made of the Q-branch strength and the P- and R-branch line strengths of the ν1 + ν21 band. The N2O data were analyzed to obtain the vibrational band strength and the coefficient, ξ, of the F factor, from which the following constants were determined: ∑P1Q,R S = 0.437±0.020 x`cm−2atm−1at 295 K, ξ = −0.0107±0.0022. The Q-branch strengths of the ν1 + 2ν22 − ν21 and the ν1 + 2ν20 − ν21 bands of N2O were also measured and their values were found to be 0.0254 ± 0.0030 and 0.0033 ± 0.0007 cm−2 atm−1 at 295 K, respectively.