Intensity measurements and relative band strengths of the fluorescent bands of the (B-X) system of I 2

Abstract

Relative integrated intensities of a few bands in the vibrational structure of the B-X fluorescent system of molecular iodine have been measured by the technique of photographic photometry. Reliable values of Franck-Condon factors and r-centroids given recently by Tellinghuisen have been employed to evaluate the variation of electronic transition moment with internuclear separation. The variation is found to be R e( r ̄ ) = const.(1−0.693 0r + 0.120 1r 2) in the range 2.76 < r < 2.81 Å. Smoothed arrays of band strengths are presented for the bands. The effective vibrational temperature of the source is found to be 340 ± 55 K.