We have observed transitions to autoionizing states in Mg using two short optical pulses. Mg atoms are initially prepared in a high lying Rydberg wave packet with the first ps laser. A second ps laser is then used to excite the inner electron, producing an autoionizing state. The dependence of the transition probability on the delay between the two lasers shows that when the second laser is tuned away from the ionic resonance, the inner electron can make a transition only when the Rydberg wave packet is near the core.
J. G. Story et al., "Spatially Resolved Transitions to Autoionizing States," Physical Review Letters, vol. 71, no. 21, pp. 3431-3434, American Physical Society (APS), Nov 1993.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.71.3431
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