Ejection of innershell electrons induced by recollision in a laser-driven carbon atom

Abstract

Ejection of core electrons as a result of recollision in a laser-driven carbon atom is theoretically investigated with a quasiclassical model. The model, called "fermionic molecular dynamics," gives rise to a ground-state carbon atom where the six electrons are paired in shells, with different binding energies. This feature renders possible, on a classical level, the discussion of the ejection of electrons from different shells. By analyzing a large number of trajectories of a carbon atom exposed to an intense, few-cycle laser pulse, we reveal a class of recollision trajectories where the recolliding electron is recaptured into the atomic core after ejecting a core electron. We also discuss the difference between quadruple ionization trajectories leading to a final C 4+ ion where the two bound electrons have opposite spin, and the trajectories where the bound electrons have equal spin.

Controlling Electron Dynamics with Carrier-Envelope Phases of a Laser Pulse

“…Time evolution of the system is governed by Hamilton’s equations of motion where c is the speed of light, and the laser electric field, E ( t , r ), and magnetic field, B ( t , r ), are given by where with the laser field strength E 0 , angular frequency ω 0 corresponding to a wavelength of 800 nm, CEP φ, and pulse length T 0 = 2π n c /ω 0 ; n c being the number of optical cycles chosen to be 3 for 7.9 fs pulse width similar to ref .…”

“…A stable quasiclassical ground-state configuration of atoms has been obtained using this FMD model and this method has already been extensively applied in studying various atomic and molecular processes including description of atoms ,− and molecules − in intense laser fields. Moreover, it was successful in achieving reasonable qualitative agreement with experimental results. , Recently, this FMD model was employed to understand the many-electron response of the carbon atom to intense laser fields …”

“…Within this quasiclassical model also referred to as fermionic molecular dynamics (FMD), the electrons are treated as classical point particles; and two nonclassical momentum-dependent auxiliary repulsive potentials are introduced to mimic the effects of the Heisenberg uncertainty principle and Pauli exclusion principle that stabilizes the multielectron system from autoionization or collapse. A stable quasiclassical ground-state configuration of atoms has been obtained using this FMD model and this method has already been extensively applied in studying various atomic and molecular processes including description of atoms ,− and molecules − in intense laser fields. Moreover, it was successful in achieving reasonable qualitative agreement with experimental results. , Recently, this FMD model was employed to understand the many-electron response of the carbon atom to intense laser fields …”

Controlling the Ultrafast Dynamics of HD+ by the Carrier-Envelope Phases of an Ultrashort Laser Pulse: A Quasi-Classical Dynamics Study

“…V H mimics the effect of the Heisenberg uncertainty principle that demands that a particle cannot be localized in position and momentum simultaneously. The FMD model has already been extensively applied to study the laser-induced dynamics of atoms, , molecules, clusters, and atom–ion collision processes. − Within this quasi-classical method, Huang et al have investigated the electron momentum distribution from H 2 + by a circularly polarized laser pulse . By back analysis of the trajectories, they showed that most of the electrons are emitted with a time lag of hundreds of attoseconds.…”

“…25 V H mimics the effect of the Heisenberg uncertainty principle that demands that a particle cannot be localized in position and momentum simultaneously. The FMD model has already been extensively applied to study the laser-induced dynamics of atoms, 22,26 + by a circularly polarized laser pulse. 32 By back analysis of the trajectories, they showed that most of the electrons are emitted with a time lag of hundreds of attoseconds.…”