The spin-rotation coupling constant γ has been determined to be for vibrational levels 1, and 2 of the state of by means of an analysis of the high-resolution absorption spectrum due to the transition in the 670–677 nm region. All rovibrational levels of the state have been observed, and improved values have been obtained for the spectroscopic parameters of vibration and rotation. In addition, the dispersed fluorescence has been recorded by populating selectively a particular rovibrational level of the A state. Using all experimental data, an improved interaction potential has been determined for which is provided in the form of an analytical Hartree-Fock-Dispersion function.
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