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- W2018229087 abstract "An extensive work on vibration-rotation spectra in the fundamental 1Σ+ electronic state of CO is reported. More than 30 000 Doppler-limited measurements corresponding to about 8500 transitions of 255 bands of 12C16O, 12C18O, 13C16O, and 13C18O, most of them observed for the first time, have been obtained with a high information Fourier transform interferometer on the sequences Δv = 1, 2, and 3. The highest v and J values are 41 and 93, respectively. Experimental vibrational levels are then well observed up to three fourths of the dissociation energy limit. These accurate infrared wavenumbers, with an additional selected set of all previous measurements, have been simultaneously fitted to the Dunham expression in a weighted nonlinear least-squares calculation covering seven different isotopic species. It significantly improves both the number of parameters (U and Δ) obtained by the best previous work (35 instead of 23) and their corresponding standard deviations. The rms of the fit is equal to 13 × 10−6 cm−1 (390 KHz). Calculated wavenumbers from the 35 reduced Dunham and mass-scaling coefficients can then be used as secondary standards, even for transitions involving high v and J values of the various isotopic species. These new parameters should be a convenient and useful tool for several purposes, such as assignment of infrared laser lines and identification of microwave and infrared transitions in astronomical spectra. The Dunham coefficients Y are also reported for 12C16O, 12C17O, 12C18O, 13C16O, 13C17O, 13C18O, and 14C16O. These experimentally determined accurate Y should also be useful for further examination of the potential energy and dipole moment formulations." @default.
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- W2018229087 date "1983-03-01" @default.
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- W2018229087 title "Dunham coefficients for seven isotopic species of CO" @default.
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- W2018229087 doi "https://doi.org/10.1016/0022-2852(83)90203-5" @default.
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