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The fragmentation and isomerization of internal energy selected acetaldehyde molecular cations
Authors:Rolf Bombach  Jean-Pierre Stadelmann  Jürgen Vogt
Institution:

Physikalisch-Chemisches Institut der Universität Basel, CH-4056 Basel, Switzerland

Abstract:The fixed wavelength photoelectron—photoion coincidence technique has been employed to study the fragmentation behaviour of excited acetaldehyde molecular cations with internal energies up to 7 eV. The recorded breakdown curves of the parent ion as well as the C2H3O+, CHO+ and CH3+ fragment ions enable to reject state specific fragmentation behaviour of the title compound into the CHO+ and CH3+ fragment ion channels. The present data give evidence of a fast isomerization of the CH3CHO+ cation from its first electronically excited state ā(2A″) to the oxirane cation in its electronical ground state X?(2B2).
Keywords:
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