Photochemically pumped I2(D’3Π2g→A’3Π2u) emission in mixtures of I2+C3F7I and I2+O3: Implications for chemically initiated, broadband optically pumped I2(D’→A’) lasers

Stech, D. J.; Muller, C. H.; Czyzak, S. R.; Neumann, D. K.
December 1986
Applied Physics Letters;12/22/1986, Vol. 49 Issue 25, p1683
Academic Journal
We report the first observation of photochemically initiated I2(D’→A’) emission at 342 nm. Mixtures of I2 and C3F7I or I2 and O3 were excited by a KrF laser at 248 nm photodissociating the C3F7I or O3. The process believed responsible for the intense D’→A’ emission is rapid energy transfer from the excited I(2P1/2) or O2(a 1Δ) photodissociation products to I2(X,v‘=0) producing I2(X,v‘=25→43) which is optically pumped by 248 nm photons to I2(D 1∑+u) and I2(F 1∑+u). Rapid collisional redistribution results in the F,D→D’ crossover. Gain of several percent per centimeter on the D’→A’ transition may be possible with the appropriate gas mixture and pump source.


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