Vibronic structure in C2H and C2D from anion slow electron velocity-map imaging spectroscopy

Jia Zhou; Garand, Etienne; Neumark, Daniel M.
September 2007
Journal of Chemical Physics;9/21/2007, Vol. 127 Issue 11, p114313
Academic Journal
The C2H and C2D radicals are investigated by slow electron velocity-map imaging (SEVI) of the corresponding anions. This technique offers considerably higher resolution (<0.5 meV) than photoelectron spectroscopy. As a result, SEVI spectra of the two isotopomers yield improved electron affinities and reveal many new structures that are particularly sensitive to vibronic coupling between the ground 2Σ+ and low-lying excited 2Π states. These structures, which encompass more than 5000 cm-1 of internal excitation, are assigned with the aid of previous experimental and theoretical work. We also show that SEVI can be applied to photodetachment transitions resulting in ejection of an electron with orbital angular momentum l=1, a p wave, in contrast to anion zero-electron kinetic energy spectroscopy which is restricted to s-wave detachment.


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