Nonlinear photodissociation of molecular iodine

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Abstract
Strong ultraviolet fluorescence originating from the radiative decay of the atomic iodine levels (3P2)6s[2]3/2 at 56092.88 cm−1 and (3P2)6s[2]5/2 at 54 633.46 cm−1 was observed when a pulsed laser beam was focused in a cell containing iodine vapour. The fluorescence intensity varied quasi-continously when the laser wavelength was scanned from 3950 to 4500 Å. Over 40 resonances at the frequency of one-photon transitions originating from the same two atomic iodine levels were observed in the fluorescence spectrum as well as in the photoionization spectrum. The intensity of both the fluorescence and the photoionization was found to vary quadratically with the laser power. The excited iodine atoms are formed by a coherent two-photon transition in molecular iodine followed by saturated photodissociation.

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