CH2I2 photodissociation: Emission spectrum at 355 nm

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Abstract
The emission spectrum from photodissociating CH2I2 excited at 355 nm is presented. Interpretation of the data is given in a time dependent picture. The progression on the CI2 symmetric stretch and even quanta in the antisymmetric stretch indicate initial motion during dissociation along the symmetric stretch coordinate and subsequent spreading in the antisymmetric stretch coordinate. The moderately strong bending fundamental suggests that the bond angle changes when the molecule is promoted from the ground to the excited state. Both dynamics and the geometry near the Franck–Condon region on the excited surface are discussed.