Abstract
ZEKE spectroscopy is based on delayed detection by pulsed field ionization. At a given excitation frequency, the time evolution of the Rydberg states that survive can be monitored from sub μs to tens of μs delay times. We compute time and frequency resolved ZEKE spectra (Remacle et al . 1996) for a realistic molecular Hamiltonian including the effect of a weak external DC field. The decay kinetics obtained from the full dynamical computations can be accurately represented by two time scales (μs and supra μs) as reported experimentally. The long lifetimes are accounted for by the extensive interseries coupling induced by the anisotropy of the molecular core.
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