Two-electron systems in strong laser fields

Abstract

In this paper we investigate the single and double ionization signals of H2 molecules, with fixed and moving nuclei, as a function of laser intensity, for two different values of laser wavelength =390 nm and =780 nm, using an approach for evaluating the ionization signals which allows the investigation of rela- tively long-lasting pulses. The He system is first investigated to benchmark our calculation against already known results. We confirm the evidence of nonsequentiality in the ionization processes of all the systems investigated. Furthermore, we show that the nuclei motion enhances the double ionization signals by means of a mechanism which is very similar to a charge-resonant enhanced ionization CREI effect Zuo and Bandrauk, Phys. Rev. A 52, R2511 1995

Strong-field phenomena caused by ultrashort laser pulses: Effective one- and two-dimensional quantum-mechanical descriptions

“…The range of such problems includes also the cases of systems with a great number of the degrees of freedom. For example, they may be the problems related to the dissociative ionization of molecules [38][39][40][41] or to the nonsequential multielectron processes [42][43][44][45]. In addition, low-dimensional effective potentials are used in the studies having little to do with conventionally considered strong-field phenomena [46][47][48].…”

High harmonic generation from pre-ionized H2in ultrashort intense laser fields

“…The temporal evolution of electrons of this system is described by the time dependent Schrödinger equation (TDSE), i.e. [24,27] …”

“…The values of these parameters are set to the same values as used by Camiolo et al [27]. The initial state is a singlet ground electronic state with an equilibrium internuclear distance R = 2.13 at rest.…”

Mapping electron dynamics in molecular H2using high-order-harmonic-generation time profiles

“…with A iν = 1.00 = A 12 and A αβ = 0.03 being softening parameters compensating the effects of the contraction of a three-dimensional (3D) potential into a 1D space, adjusted to reproduce accurately the relevant physical properties of the real 3D H 2 system [41]. In these equations, Z ν (ν = α,β) is the charge of nucleus ν (here both equal 1), and R α (R β ) and r 1 (r 2 ) denote the nucleus α(β) and electron 1(2) 1D variables, respectively.…”