Sudden perturbation approximations for interaction of atoms with intense ultrashort electromagnetic pulses
dc.contributor.author | Lugovskoy, Andrey | |
dc.contributor.author | Bray, I. | |
dc.date.accessioned | 2017-01-30T11:39:23Z | |
dc.date.available | 2017-01-30T11:39:23Z | |
dc.date.created | 2015-12-21T20:00:13Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Lugovskoy, A. and Bray, I. 2015. Sudden perturbation approximations for interaction of atoms with intense ultrashort electromagnetic pulses. European Physical Journal D. 69 (12). | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/13771 | |
dc.identifier.doi | 10.1140/epjd/e2015-60471-2 | |
dc.description.abstract |
© 2015 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. The response of an atom to the action of a pulse shorter than the Kepler period of the optically-active electron is often treated analytically using the sudden-perturbation approximation (SPA). It relies on the truncation of the evolution operator expansion in a series over the dimensionless parameter e sys t L, where e sys is the system-dependent characteristic energy and t L is the pulse duration. We examine the SPA with the use of a basis-based solution of the time-dependent Schrödinger equation (TDSE) for the case of a hydrogen atom interacting with two different types of ultrashort pulses, a half-cycle pulse and a few-cycle pulse. The length-gauge form of the electron-field interaction potential is used. The SPA transition probabilities are shown to deviate slightly but systematically from the correct values for the positive-energy states in the region where the sudden-perturbation condition is violated. It is shown that the SPA expectation value of the electron displacement as a function of time differ qualitatively from what follows from the ab initio TDSE solution. Nevertheless, the SPA is shown to be a good approximation for the description of the expectation value of the electron momentum. | |
dc.title | Sudden perturbation approximations for interaction of atoms with intense ultrashort electromagnetic pulses | |
dc.type | Journal Article | |
dcterms.source.volume | 69 | |
dcterms.source.number | 12 | |
dcterms.source.issn | 1434-6060 | |
dcterms.source.title | European Physical Journal D | |
curtin.department | Department of Physics and Astronomy | |
curtin.accessStatus | Fulltext not available |
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