Measurements of relative transition probabilities and the variation of the electronic transition moment for N2C3Πu-B3Πgsecond positive system

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Abstract
Accurate values of the relative transition probabilities Aupsilon ' upsilon ''for 41 bands in the N2second positive system have been measured using single-photon counting techniques on a repetitive pulsed source. A computer code simulating the band structure, including multiplet splitting, and intensity distribution enables any band intensity to be deduced from the fractional intensity seen at the peak in the P branch (band-head). The variation of the electronic transition moment with internuclear separation Re(r) is obtained from the measured Aupsilon ' upsilon ''by means of a weighted least-squares curve-fitting procedure based on nth moment r centroids. It is best represented by a polynomial of degree 2, (1-1.336r+0.487r2) whose curvature is in the opposite sense to previously derived fits.