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 in the wavelength range 600 to 700 nm. The signal is approximately independent of wavelength in this region but decreases near 700 nm. This three-beam signal is attributed to Na* formed by photoexcitation of the NaKCl reaction complex. The effective two-body cross section is circa 10^-21 cm² in a laser field of {~}3000 W/cm².
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Maguire et al. (1983) studied this question.
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