LASER-EXCITED FLUORESCENCE OF $I_{2}$: VARIATION OF ELECTRONIC TRANSITION MOMENT IN THE B-X SYSTEM
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Date
1982
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Ohio State University
Abstract
Fluorescence in the $B^{3}\Pi_{u} (0^{+}) - X^{1}{\Sigma^{+}}_{g}$ system of $I_{2}$, excited by $5145 \AA$ line of $Ar^{+}$ laser operating in single mode, was recorded photoelectrically on a SPEX double monochromator equipped with holographic gratings. The intensities of P (17) lines originating from $\nu' = 43$ end with $\nu"" = 0 to 42$ were measured; these measurements cover the R-centroid range from $2.65 to 3.10 \AA$. A standard tungsten lamp was used to calibrate the spectrial response of the spectrometer = photomultiplier combination. The squared transition moment $|M(\bar{R})|^{2}$ obtained in the present work increases from $\bar{R} = 2.65 to 2.85 \AA$ by about 50% and decreases at higher R. This variation of $|M(\bar{R})|^{2}$ with $\bar{R}$ differs considerably from that reported $earlier.^{1,2,3}$
Description
$^{1}$L. Brewer and J. Tellinghuisen, J. Chem. Phys. 56, 3929-3938 (1972). $^{2}$J.B. Koffend, R. Bacis and R.W. Field, J. Chem, Phys, 70, 2366-2372 (1979). $^{3}$T.K. Balasubramanian, G.L. Bhale. M.N. Dixit and N.A. Marasimham, J. Mol. Spectrose. 88, 259-263 (1981). $^{\ast}$ G.L. Bhale is on leave from the Spectroscopy Division, Bhabha Atomic Research Centre, Bombay, India.