DIFFERENTIATING GEOMETRIC ISOMERS BY LASER ION-BEAM PHOTODISSOCIATION
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The laser-ion beam photodissociation reactions of the cls- 1,3-pentadiene and frans-1,3-pentadiene C5H8+ Ions and the c/s,frans-2,4-hexadiene and trans,trans -2,4-hexadlene C6H10+ Ions have been investigated. The photodissociation spectra are found to agree qualitatively with the published ion cyclotron resonance (ICR) photodissociation data. Although the C5H8+ and CgH10+ geometric isomers exhibit indistinguishable photodissociation spectra and product ion branching ratios, the wavelength-dependent kinetic energy release values are unique for the individual isomers. The significant changes in the photofragment kinetic energy release values for the frans-1,3-pentadiene and frans.frans-2,4-hexadiene ions as a function of photon energy are attributed to isomerization of the photoexcited parent ion prior to dissociation. 1985, American Chemical Society. All rights reserved.