Two-active electron approach to multi-electron systems in intense ultrashort laser pulses: Application to Liâ•fi
نویسندگان
چکیده
The interaction of Li– with an ultrashort intense laser pulse is investigated by solving the time-dependent Schrödinger equation (TDSE) in the dipole approximation using a two-active electron approach. We describe the numerical solution of the TDSE and give a more detailed presentation of a technique for obtaining angular distributions for double ionization by intense ultrashort laser pulses. We show how selection rules observed in the angular distributions for double ionization by an intense laser field can be derived from the symmetry properties of the wave function. In an attempt to elucidate the mechanisms for double ionization in the multiphoton regime, we have performed numerical experiments for ionization by single cycle and double half-cycle pulses. Our preliminary results unveil the important contribution of the shake-off mechanism, in addition to the rescattering and sequential ionization mechanisms.
منابع مشابه
Angular distributions for double ionization of Li- by an ultrashort, intense laser pulse.
We predict photoelectron angular distributions for double ionization of Li- by both weak and intense ultrashort, linearly polarized laser pulses by direct numerical integration of the three-dimensional, time-dependent Schrödinger equation. Li- is treated as a two-active electron system. Near threshold, for low intensity we recover general features of angular distributions for one-photon double ...
متن کاملSingle-active-electron ionization of C60 in intense laser pulses to high charge states.
Sequential ionization of the C(60) fullerene to high charge states in ultrashort intense laser pulses is investigated within the strong-field S-matrix approach. Ion yields are calculated and saturation intensities are determined for a broad range of laser wavelengths between 395 and 1800 nm at different pulse lengths. Comparisons of the S-matrix predictions for the saturation intensities with r...
متن کاملnphys620 Krausz Progress.indd
From 1964, when mode-locking was discovered, until 2001, when the fi rst sub-femtosecond (that is, attosecond) pulses were produced1,2, laser pulse durations decreased by about three orders of magnitude (Fig. 1). Advances came through constantly refi ning known concepts of dispersion control and Kerr nonlinearities, aided by improved laser materials. Although a laser scientist from 1965 would h...
متن کاملMultielectron system in an ultrashort, intense laser field: A nonperturbative, time-dependent two-active-electron approach
متن کامل
Effects of intense laser pulse properties on wake field acceleration in magnetized plasma: Half-Sine Shape (HSS) and Gaussian Shape (GS) pulses
In this paper, we have simulated the excitation of wake fields in the interaction of an intensive laser pulses having Half-Sine and Gaussian time envelopes with a fully ionized cold plasma using particle in cell (PIC) method. We investigated the dependency of wake filed amplitude to different laser and plasma parameters such as laser wavelength, pulse duration and electron number density. In ad...
متن کامل