Fig. 2. Comparison of (a) measured laser light output vs time compared with (b) calculated values. The pressure of IBr was 3 torr, with 4% Br2, I2. In the calculations C = 5000. The pumping light intensity is inverted. getting rid of the excitation energy. Some of the values are uncertain and are based on similar reactions in I2. The exchange reactions that depopulate the lower laser level and make lasing possible are listed as items 25 and 26. Experimental measurements of reaction 25 have been reported by Clyne and Cruze, (27) who deduce a high rate coefficient Ex = 3.5 x 1011 cm3 s-1. We have been unable to find a rate coefficient for reaction 26, but computer runs for E2 = 0 and E2 = E, did not differ greatly because the concentration of I2 is much less than that of IBr. IV. RATE EQUATIONS In the following equations the terms in parenthesis represent the densities of atomic and molecular species; n is the density of photons. The quantity A is the
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