Abstract
A study of shape resonance energies and widths in the A 1Π state of 12CH+ and 13CH+ is reported. The experimental data were obtained by high-resolution laser photofragment spectroscopy of CH+ in a fast ion beam. Spectroscopic transitions were recorded by tunable laser excitation from levels of the X 1Σ+ state to shape resonances (quasibound rotational levels) of the A 1Π state and detection of photoproduct C+ ions. Some of the dissociation lifetimes are sufficiently short to cause broadening of the spectral lines. The linewidths are interpreted in terms of tunnelling through the centrifugal barrier and the effects of rotational-electronic and radial coupling. The e lambda-doublet component in two of the resonances is found to have a narrower linewidth than the corresponding f component. This is shown to be due to the effect of the rotational-electronic (Coriolis) interaction on the shapes of the rotationally adiabatic potential-energy curves which determine the tunnelling probability. The contributions to the predissociation rates are calculated and are in good agreement with the experimental results.
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