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Abstract
The laser-ion beam photodissociation reactions of the cis-1,3-pentadiene and trans-1,3-pentadiene C/sub 5/H/sub 8//sup +/ ions and the cis,trans-2,4-hexadiene and trans,trans-2,4-hexadiene C/sub 6/H/sub 10//sup +/ ions have been investigated. The photodissociation spectra are found to agree qualitatively with the published ion cyclotron resonance (ICR) photodissociation data. Although the C/sub 5/H/sub 8//sup +/ and C/sub 6/H/sub 10//sup +/ 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 trans-1,3-pentadiene and trans,trans-2,4-hexadiene ions as a function of photon energy are attributed to isomerization of the photoexcited parent ion prior to dissociation. 28 references, 5 figures, 2 tables.
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