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## Photoexcitation of Near-Threshold Atomic Energy Levelsby
David A. Cardimona
Laser excitation to near-threshold continuum states is found to result in non-exponential decay of the ground state population. The non-exponential time dependence is described as arising from the spreading of the initial wavepacket in a Coulomb field and is shown to be independent of the form of the interaction energy used(
Near-threshold excitation in neutral atoms mixes an infinite number of Rydberg states with the continuum. The inevitable sum over bound states and integral over continuum states which arise in calculations involving such mixing, are found to individually diverge. A method is developed which allows the sum and integral to be performed simultaneously, yielding a finite result. We argue that there is actually a finite experimental limit to the Rydberg series of bound states due to nearest-neighbor interactions and applied field power broadening.
Web page maintained by Hideomi Nihira ( nihira@optics.rochester.edu ). Last modified 13 September 2006 |