Isotopic Effects and Collisional Deactivation in the Mercury Photosensitized Decomposition of Ethylene

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Abstract
Mercury photosensitized decomposition of C2H4, C2D4, cis‐C2D2H2, and C2H4 with excess xenon added, has been investigated at room temperature. An isotopic effect in the intramolecular decomposition of ethylene has been established, as well as an extensive isotopic isomerization in the course of collisional deactivation of the energy rich molecules. The cis‐dideuteroethylene isomerizes not only to the trans‐ but also to the anti‐form. The experimental results are discussed in terms of the intramolecular decomposition and collisional deactivation of the excited molecules formed in the primary process.

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