Measurements of relative transition probabilities and the variation of the electronic transition moment for N<sub>2</sub>C<sup>3</sup>Π<sub>u</sub>-B<sup>3</sup>Π<sub>g</sub>second positive system

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<jats:p>Accurate values of the relative transition probabilities A<jats:sub>upsilon ' upsilon ''</jats:sub>for 41 bands in the N<jats:sub>2</jats:sub>second 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 R<jats:sub>e</jats:sub>(r) is obtained from the measured A<jats:sub>upsilon ' upsilon ''</jats:sub>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+0.487r<jats:sup>2</jats:sup>) whose curvature is in the opposite sense to previously derived fits.</jats:p>

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