Abstract

N. Sahoo

High power pulsed N  laser was used as pumping source for the dye laser. Rhodamine 6G (Rh 6G)and Rhodamine B (Rh B) dyes in alcohol were exposed separately to N laser flashes to observe the fluorescence. The yellowish fluorescence was seen with Rh 6G and reddish fluorescence was seen with Rh B. The spectra of each dye at various concentrations (1 x 10^-4,5 x 10^-4,1x10^-3 and 5x10^-3M) were recorded and the spectral range spread between 580-605 nm for Rh 6G and 595 - 630 nm for Rh B respectively. The long wave length absorption band with dye is attributed to the transitionfrom the "electronic ground state S_°, to the first excited single state S₁ . The reverse process S₁  —> S_° properties of the solvent, both dyes show intense fluorescence. This is due to the % electron density with in C=N bond of the Rh 6G and Rh B molecules.is responsible for its fluorescence. Depending upon the molecular structure of the dye and the

fluorescence; structure; molecules pumping

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