Photoexcitation of reaction complexes in the reaction K+NaCl→KCl+Na

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Abstract
Emission at the Na D lines has been observed from the intersection of crossed molecular beams of K and NaCl irradiated by a cw dye laser at wavelengths from 590 and 735 nm. The three-beam signal exhibits a threshold near 735 nm and is linearly dependent on the laser and molecular beam intensities. This three-beam signal has been observed under experimental conditions in which all two-beam signals are accounted for, and is attributed to the formation of Na* by photoexcitation of the KNaCl reaction complex. The effective two-body cross section for the process is approximately 10−21 cm2 in a laser field of 1.5 kW/cm2.