INTENSITY MEASUREMENTS OF THE $2\nu_{3}$ BAND OF $^{12}C^{16}O^{18}$

Author Institution: Nasa Ames Research Center; Jet Propulsion Laboratory, California Institute of TechnologyThe absolute line intensities of transitions in the $2\nu_{3}$ vibrational band of $^{12}C^{16}O ^{18}O$ at $4639.5 cm^{-1}$ have been measured in $CO_{2}$ with natural isotopic abundance. The absolute uncertainty of the derived band intensity is $\pm 3\%$ or better. The spectra of $CO_{2}$ gas samples in the range of 45 to 65 torr at room temperature were recorded at $0.012 cm^{-1}$ resolution using the McMath Fourier transform spectrometer located at Kitt Peak National Observatory / National Solar Observatory, AZ. The rotationless band strength of $1.4416(14) \times 10^{-23} cm^{-1}$/(molecule/$cm_{2}$) at 296 K has been obtained along with a small first order Hermann-Wallis parameter of $A_{1} = 3.6 (2.0) \times 10^{-5}$. Our band strength value is larger by 16\% than that obtained by Abubakar and Shaw [Appl. Opt. 23, 3310-3315 (1984)] and which is being currently used in the HITRAN compilation. Intensity parameter determinations of the $2\nu_{3}$ band of $^{12}C ^{16}O ^{17}O$ will also be discussed