Multiphoton above-threshold ionization of atoms in intense laser fields
Above-Threshold Ionization (ATI) of atoms in a new phenomenon in intense field laser-atom interactions. The emergence of this new phenomenon challenges the established lowest-order perturbation theory in the theoretical study of multiphoton processes. In this thesis, a dressed-state perturbation theory is presented, which treats the dominant terms in the calculation of ATI cross sections non-perturbatively. The field influence on atomic energy levels is studied to give a quantitative measure of the validity of the lowest-order perturbation theory. The field influence on the measurement of the atomic ionization threshold and the photoelectron energy spectrum is discussed. In addition, a statistical model is proposed to study the photoelectronenergy spectrum.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (USA)
- OSTI ID:
- 6285155
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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