Volume 114, Number 2, April 2016
|Number of page(s)||6|
|Section||Atomic, Molecular and Optical Physics|
|Published online||04 May 2016|
Stimulated Raman scattering in hydrogen by ultrashort laser pulse in the keV regime
1 Centre des Lasers Intenses et Applications, Université de Bordeaux-CNRS-CEA - 33405 Talence Cedex, France
2 Department of Physics and Centre for Advanced Quantum Physics, University of Bucharest MG-11, Bucharest-Măgurele, 077125 Romania
Received: 26 February 2016
Accepted: 25 April 2016
This letter addresses the problem of stimulated Raman excitation of a hydrogen atom submitted to an ultrashort and intense laser pulse in the keV regime. The pulse central frequency ω of 55 a.u. (about 1.5 keV) is in the weakly relativistic regime, (c is the speed of light in vacuum and a0 the Bohr radius) and the pulse duration is τ ≈ 18.85 a.u. (about 456 attoseconds). We solve the corresponding time-dependent Schrödinger equation (TDSE) using a spectral approach, retardation (or nondipole) effects are included up to , breaking the conservation of the magnetic quantum number m and forcing the resolution of the TDSE in a three-dimensional space. Due to the laser bandwidth, which is of the order of the ionization potential of hydrogen, stimulated Raman scattering populates nlm excited states (n and l are the principal and azimuthal quantum numbers, respectively). The populations of these excited states are calculated and analyzed in terms of l and m quantum numbers, this showing the contributions of the retardation effects and their relative importance.
PACS: 32.80.Rm – Multiphoton ionization and excitation to highly excited states / 32.30.Rj – X-ray spectra / 42.65.Dr – Stimulated Raman scattering; CARS
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.