Observation of CH3Zn as a stable product in the KrF laser photodissociation of (CH3)2Zn

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Abstract
Single‐photon dissociation of (CH3)2Zn has been examined at 248 nm in the gas phase. The relative yields of CH3Zn and Zn as a function of buffer gas pressure were determined by laser‐induced fluorescence. With He as the buffer gas, the yield of CH3Zn increases from ∼20% at very low pressure to ∼65% at 500 Torr. The yield of Zn atoms correspondingly drops over the same pressure range. This behavior is due to the increasing probability for collisional stabilization of the primary photoproduct, vibrationally hot CH3Zn, as the buffer gas pressure increases, thereby quenching its subsequent thermal dissociation to CH3 and Zn. Information on the nascent vibrational energy distribution of the CH3Zn photoproduct is obtained by examining the probability of CH3Zn stabilization vs buffer gas pressure.