The decay of 1-chloropropyne cation studied by photoelectron-photoion coincidence spectroscopy |
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Authors: | Josef Dannacher Jean-Pierre Stadelmann |
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Institution: | Physikalisch-chemisches Institut der Universität Basel, CH-4056 Basel, Switzerland |
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Abstract: | The decay of internal energy selected 1-chloropropyne cations is investigated using the fixed wavelength (He-Iα) photoelectron-photoion coincidence technique. The breakdown curves of the molecular ion and the C3H2Cl+, C3HCl+, CCl+, C3H+3, C3H+3, C3H+ fragment ions are reported. For 1-chloropropyne cations initially formed in their 2E state it is found that four fragmentation channels compete with a non-dissociative relaxation pathway. The average kinetic energies released on formation of C3H+3 and C3H+3 are deduced from the time-of-flight distributions of these fragment ions measured at different internal energies of the molecular ion. The coincidence data are supplemented by electron impact appearance energies. The obtained decay pattern of 1-chloropropyne cation is compared with the breakdown diagrams reported for the C3H+4 isomers, i.e. allene-, propyne- and cyclopropene cations. |
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