Drift of the scattered wave packet in strong-field atomic stabilization

Abstract

Details of the dynamics of ultrastrong-field photoionization are studied for a one-dimensional model atom with a short-range potential. The wave packet's drift due to its scattering on the binding potential is analyzed. The Kramers-Henneberger frame transformation is generalized in such a way that the drift is formally included and the packet's shape becomes stable in the new frame. Such an approach in combination with the Ehrenfest description of the drift trajectory allows one to model the behavior of the packet and to interpret the details of the atomic stabilization.PACS number͑s͒: 42.50.Hz, 32.80.Rm, 32.80.Gc ‫ץ‬ 2 ‫ץ‬y 2 ͑ y,t ͒ϩU"yϩ␤͑ t ͒…͑ y,t ͒ϪF͑t ͒"yϩ␤͑ t ͒…͑ y,t ͒, ͑3͒wherePHYSICAL REVIEW A, VOLUME 61, 043402

Dynamics of strong-field photoionization in two dimensions for short-range binding potentials

“…4, we can see fast oscillations in the x direction in the upper plot and the magnetic drift in the y direction in lower one. A slow drift, similar to that obtained in [8], is also visible at the graph of x .…”

Exactly solvable model for nonlinear light-matter interaction in an arbitrary time-dependent field

“…Approximate ionization rates were calculated in [23], and numerical simulations of photoionization were performed in [24]. More recently, there have been a number of papers in which various approximate and numerical methods are applied to one-dimensional systems, such as state-specific expansion [25], Kramers-Henneberger frame transformation [26], and least-squares fitting of time evolution [27]. This model also served as a testbed for numerical simulation techniques [28] and analytic theories [29,30].…”

“…where we have again used that as F → 0, A(t) → 1. Expressions (25) and (26) together with (22) constitute our final result. They allow us to calculate the exact nonlinear current induced by an arbitrary time-dependent field F (t).…”

Recombination in strong laser fields: Manifestation of a slow drift

“…As it has been shown in the works devoted to the atomic stabilization, in laser fields of order of a few atomic units most of the electron wave packet moves as a whole, performing oscillations in the rhythm of the field. Additionally, long time oscillations of the packet are possible which are due to an asymmetry of the interaction of its different parts with the binding potential; in our earlier papers [4,5,6] we have called them a slow drift. The slow drift has the range equal to that of the classical oscillations of a free electron in the laser field and it was possible to give an analytic formula for its frequency in the case of the binding potential being a rectangular well.…”

“…In the laboratory frame the KH well oscillates in the rhythm of the laser field and may also perform the slow drift, which was described by a generalized model of Ref. [4]. For longer * Electronic address: jacek@phys.uni.torun.pl times a decay of the KH state can be observed, due to an influence of higher terms of the above-mentioned Fourier expansion, and the corresponding decay rate has been evaluated [7].…”