| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1863609 | Physics Letters A | 2015 | 5 Pages |
•A two-electron time-dependent Schrödinger equation analysis.•Harmonic emission spectrum from the neutral He atom in intense laser field.•An extended harmonic plateau with many new harmonic cutoffs.•A propose model of double recombination arising from electron correlation effect.•A general characteristic of double recombination in the two-electron system.
Two-electron harmonic emission from the He atom has been investigated by solving the two-electron time-dependent Schrödinger equation (TDSE), which exhibits an extended plateau and many new harmonic cutoffs beyond the classical single-electron harmonic cutoff. Theoretical analyses show that these extended new cutoffs are caused by the sequential double recombination and the nonsequential double recombination of the two electrons, which is a general characteristic for the two-electron harmonic emission and which is revealed through the investigation on laser parameter effects. Moreover, from analyzing the time-dependent wave functions, the motions of the two electrons and the single and double ionization time have been described.
