Abstract
The photoionisation of rubidium in strong infra-red laser fields based on ab initio calculations was investigated. The bound and the continuum states are described with Slater orbitals and Coulomb wave packets, respectively. The bound state spectra were calculated with the variational method and we found it reproduced the experimental data within a few percent accuracy. Using the similar approach, ionisation of Rb was also successfully investigated. The effects of the shape and the parameters of the pulse to the photoionisation probabilities and the energy spectrum of the ionised electron are shown. These calculations may provide a valuable contribution at the design of laser and plasma based novel accelerators, the CERN AWAKE experiment.Graphical abstract
Highlights
The study of the ultrafast dynamics of electrons in intense short laser pulses is a hot topic nowadays [1]
We applied two different techniques: time-dependent close coupling and classical trajectory Monte Carlo method. In the former one, the continuum states have been described with Slater-type orbitals and the continuum states have been approximated with Coulomb wave packets
First we reconstructed the eigenfunctions of the free Hamiltonian operator on our basis set and found that the generalized energy eigenvalues of the Hamiltonian operator are in a good agreement with the experimental values
Summary
The study of the ultrafast dynamics of electrons in intense short laser pulses is a hot topic nowadays [1]. We study the ionizaton of Rb atom problem with two different methods: full-fledged ab initio quantum mechanical method and classical trajectory Monte Carlo (CTMC) method In the former one, computationally we realized a time-dependent coupled-channel method where the wave functions of the channels are constructed with Slater orbitals and regular Coulomb wave packets with equidistant finite widths in energy. This basis set was originally introduced to study heavy-ion and He atom collision in 2002 by Barna [18] later become sophisticated and culminated to describe the angular distribution in twophoton double ionisation of helium by intense attosecond soft-x-ray pulses [19]. Atomic units are used throughout the paper if not stated otherwise
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