The “transfer efficiency” is a measure of the fraction of collisions between X* and Y that result in the formation of the upper level Yv. Actually the fraction should be kxY(k3M + k2YY but here it is simplified to the number FT, defined by The expression is useful if k3M >> k2Y, and also assumes the densities Yand M are of the same order. The “upper laser level storage” is a measure of the density in the upper laser level Yv. The rate of production of Yv is proportional to kxX* Y, and the rate of loss is proportional to k4M + k5Y + keZ. The density Yv is large when the quantity Fu is large, defined by The value of the individual figures of merit lies in that they can pinpoint the quality of performance in one particular reaction or region of the energy flow chart. Numerical values for D and the rate coefficients for the systems Br2-CO2-He, Br2-H2O-He, Br2-HCN-He, and I2-HF-He are shown in Table 2, which also gives the figures of merit and the quantum efficiencies.
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