Schlagheck, Peter and Pingel, Detlef and Schmelcher, Peter (2003) Collinear helium under periodic driving: Stabilization of the asymmetric stretch orbit. PHYSICAL REVIEW A, 68 (5): 053410. ISSN 1050-2947, 1094-1622
Full text not available from this repository.Abstract
The collinear eZe configuration of helium, with the electrons on opposite sides of the nucleus, is studied in the presence of an external electromagnetic (laser or microwave) field. We show that the classically unstable "asymmetric stretch" orbit, on which doubly excited intrashell states of helium with maximum interelectronic angle are anchored, can be stabilized by means of a resonant driving where the frequency of the electromagnetic field equals the frequency of Kepler-like oscillations along the orbit. A static magnetic field, oriented parallel to the oscillating electric field of the driving, can be used to enforce the stability of the configuration with respect to deviations from collinearity. Quantum Floquet calculations within a collinear model of the driven two-electron atom reveal the existence of nondispersive wave packets localized on the stabilized asymmetric stretch orbit, for double excitations corresponding to principal quantum numbers of the order of Ngreater than or similar to10.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NONSEQUENTIAL DOUBLE-IONIZATION; ELECTRONIC WAVE-PACKETS; DRIVEN HELIUM; HAMILTONIAN-SYSTEMS; CLASSICAL DYNAMICS; EXCITED HELIUM; LASER FIELDS; ATOM; STATES; HYDROGEN; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Jul 2021 12:31 |
| Last Modified: | 27 Jul 2021 12:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38490 |
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