Intensity measurements and relative band strengths of the bands (B to X) system of lanthanum oxide

Relative integrated intensities for the 40 bands of the (B to X) system of lanthanum oxide have been measured by the technique of photographic photometry. A Morse model is employed to compute the Franck-Condon factors and the r-centroids. The variation of the electronic transition moment R e (r) with the internuclear separation r is found to be R/sub /e(r)=const*exp(1.98r) in the range 1.643AA<r<1.995AA. Smoothed relative band strengths are derived for the 27 bands. Effective vibrational temperature of the source is determined.