Controlling multiple returnings in non-sequential double ionization with orthogonal two-color laser pulses

Abstract

With the three-dimensional semi-classical ensemble model, we studied the non-sequential double ionization by orthogonal two-color laser pulses. Our calculations show that the proportion of events experiencing multiple returnings, the sum of the final energies of two electrons, and the ion momentum distribution depend on the relative phase of the two-color fields, exhibiting oscillatory behavior with a period of π. Back analysis of these trajectories reveals that we can control the recollision energy of the electron by changing the relative phase of the two-color laser pulse. As a consequence, the trajectories of multiple-returning ions change with the relative phase, resulting in relative-phase-dependent ion momentum distributions. The result shows that the momentum distribution of the ions in the trajectories of multiple returnings is clearly wider than that for the case of single returning. For the multiple-returning events, the binary recollision leads to a smaller scattering angle of the first electron.

Multi-Electron Ionization and Coulomb Explosion of the IBr Molecule in the Near-Infrared Femtosecond Laser Field

“…This means that when the stretched length of the internuclear distance exceeds 3.68 Å, the CT process is prohibited from occurring. Therefore, once the charge state (2, 1) has been formed, it has no chance to undergo further charge transfer and form the charge state (1,2). Other channels are similar.…”

“…The ionization process governs many other physical processes, including high harmonic generation, photoelectron holographic imaging, molecular dissociation, electron correlation, etc. [1][2][3][4][5][6][7][8][9]. With the development of femtosecond and attosecond laser pulses, scientists now have better knowledge of ionization [10][11][12][13][14][15][16][17][18].…”

The modeling non-sequential double ionization of helium atom under high-intensity femtosecond laser pulses with shielding charge approximation

“…Double ionization has been observed in experimental studies [16][17][18][19] and modeled with the theory. Various models are employed to explain non-sequential double ionization, including the classical ensemble [20][21][22][23][24][25], S-matrix [26,27], quantitative re-scattering (QRS) model [28,29], and the solution of the time-dependent Schrödinger equation (TDSE). Out of these models, the numerical solution of TDSE is widely regarded as being more accurate [30][31][32].…”