CO 1-0 band isotopic lines as intensity standards

Fundamental band vibration-rotational line intensities are reported for the (C-12)(O-16), (C-13)(O-16), and (C-12)(O-18) molecules. The intensities were computed using numerically obtained matrix elements of a recently, determined electric dipole moment function. New intensity measurements for some of these lines obtained via high-resolution Fourier spectra are also reported. The overall consistency (approximately 2.2 percent) between calculations, which are based on recent experimental determinations of CO 1-0 band intensities, not including our own, those of the authors, and independent experimental results of the authors suggests that the lines of the fundamental band of CO can be used as absolute intensity standards.