Abstract
The time-dependent population transfer process of N2+ generated in an intense laser pulse has been investigated using the quasi-stationary Floquet theory by assuming that N2+ experiences an intense laser pulse with the sudden turn-on. A light-dressed B state is formed with a significant amount of population when pulse is suddenly turned on and is adiabatically transformed to the vibrational ground state (v = 0) of the field-free B state when the pulse vanishes. In addition, a part of the population is transferred to the electronically excited A state through one-photon resonance, which also contributes to decreasing the final population in the X state, facilitating the population inversion between the B state and the X state.
Highlights
A pulsed intense laser field induces ionization of atoms and molecules when the amplitude of the laser field is sufficiently high, so that the generated ions populated in most cases dominantly in the electronic ground state is exposed to the remaining part of the intense laser pulse
At the very beginning of the interaction (t = 0), a significant amount of population is distributed in the upper Floquet state associated with the sudden-turn-on of the laser field and that this upper Floquet state is connected adiabatically to the field-free upper state appearing after the interaction with the laser pulse, resulting in the population transfer to the field-free upper state
This scenario of the population transfer to the excited state is expected to be universal, and it can be applied to the interpretation of population inversion of any kind of atomic and molecular ions created in a pulsed intense laser field
Summary
A pulsed intense laser field induces ionization of atoms and molecules when the amplitude of the laser field is sufficiently high, so that the generated ions populated in most cases dominantly in the electronic ground state is exposed to the remaining part of the intense laser pulse. This scenario of the population transfer to the excited state is expected to be universal, and it can be applied to the interpretation of population inversion of any kind of atomic and molecular ions created in a pulsed intense laser field.
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