Resonance-enhanced two-photon ionization of hydrogen atom in intense laser field investigated by Bohmian-mechanics*

Abstract

Resonance enhanced two-photon ionization process of hydrogen atom via the resonant laser pulse is studied by Bohmian mechanics (BM) method. By analyzing the trajectories and energies of Bohmian particles (BPs), we find that under the action of high frequency and low intensity multi-circle resonant laser pulses, the ionized BPs first absorb one photon completing the excitation, and then absorb another photon, completing the ionization after staying in the first excited state for a period of time. The analysis of work done by the forces shows that the electric field force and quantum force play a major role in the whole ionization process. At the excitation moment and in the excitation-ionization process, the effect of the quantum force is greater than that of the electric field force. Finally, we discuss the principle of work and energy for BPs, and find that the electric field force and quantum force are non-conservative forces whose work is equal to the increment of mechanical energy of the system. In addition, it is proved that the quantum potential energy actually comes from the kinetic energy of the system and the increment of kinetic energy is equal to that of the kinetic energy of the system.

Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme

“…[18] Most of population-trapping researches concentrate in monochromatic laser fields. [19][20][21] Since appreciable laser line width is inevitable in practical applications of LIS, [22] consideration of metastable state in a non-monochromatic laser field makes atomic multi-step photoionization study more practical and applicable for specific elements.…”