Change search
ReferencesLink to record
Permanent link

Direct link
Ionization dynamics beyond the dipole approximation induced by the pulse envelope
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Show others and affiliations
Number of Authors: 5
2016 (English)In: Physical Review D, ISSN 2469-9926, Vol. 93, no 5, 053411Article in journal (Refereed) Published
Abstract [en]

When atoms and molecules are ionized by laser pulses of finite duration and increasingly high intensities, the validity of the much-used dipole approximation, in which the spatial dependence and magnetic component of the external field are neglected, eventually breaks down. We report that, when going beyond the dipole approximation for the description of atoms exposed to ultraviolet light, the spatial dependence of the pulse shape, the envelope, provides the dominant correction, while the spatial dependence of the carrier is negligible. We present a first-order beyond-dipole correction to the Hamiltonian which accounts exclusively for nondipole effects stemming from the carrier envelope of the pulse. We demonstrate by ab initio calculations for hydrogen that this approximation, which we refer to as the envelope approximation, reproduces the full interaction beyond the dipole approximation for absolute and differential observables and proves to be valid for a broad range of high-frequency fields. This is done both for the Schrodinger and the Dirac equation. Moreover, it is demonstrated that the envelope approximation provides an interaction-term which gives rise to faster numerical convergence in terms of partial waves compared to its exact counterpart.

Place, publisher, year, edition, pages
2016. Vol. 93, no 5, 053411
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-131525DOI: 10.1103/PhysRevA.93.053411ISI: 000376239900011OAI: oai:DiVA.org:su-131525DiVA: diva2:945918
Available from: 2016-07-04 Created: 2016-06-21 Last updated: 2016-07-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Kjellsson, TorLindroth, Eva
By organisation
Department of Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 2 hits
ReferencesLink to record
Permanent link

Direct link