Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | L041103 |
| Fachzeitschrift | Physical Review A |
| Jahrgang | 105 |
| Ausgabenummer | 4 |
| Publikationsstatus | Veröffentlicht - 25 Apr. 2022 |
Abstract
When an atom is ionized by a strong laser pulse, the field can drive the released electron back to the parent ion and trigger the emission of a high-order harmonic photon with a frequency that is a function of the time of ionization. The attractive Coulomb potential causes a slowdown of the outgoing electron that must be compensated by an earlier release into the accelerating field to produce the same harmonic frequency as without the Coulomb force. By numerical solution of the time-dependent Schrödinger equation for a helium model atom, we demonstrate that such a subtle time shift of about 35 attoseconds is measurable by streaking with a weak, orthogonally polarized field combined with a complex-time trajectory interpretation. A comparison of results for high and low streaking frequency shows that only the high-frequency method measures the Coulomb shift well. This is confirmed by a classical trajectory model and by the analytical R-matrix theory.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
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in: Physical Review A, Jahrgang 105, Nr. 4, L041103, 25.04.2022.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Revealing Coulomb time shifts in high-order harmonic generation by frequency-dependent streaking
AU - Yue, Shengjun
AU - Xue, Shan
AU - Du, Hongchuan
AU - Lein, Manfred
N1 - Funding Information: We thank N. Eicke, X. Zhu, and S. Brennecke for valuable discussions. We thank O. Smirnova and L. Torlina for providing the imaginary parts of the ARM Coulomb time shifts as a cross-check for our calculation. This work has been supported by the China Scholarship Council, the Deutsche Forschungsgemeinschaft through the Priority Programme 1840, and by the National Natural Science Foundation of China (Grants No. 11874030 and No. 11904146).
PY - 2022/4/25
Y1 - 2022/4/25
N2 - When an atom is ionized by a strong laser pulse, the field can drive the released electron back to the parent ion and trigger the emission of a high-order harmonic photon with a frequency that is a function of the time of ionization. The attractive Coulomb potential causes a slowdown of the outgoing electron that must be compensated by an earlier release into the accelerating field to produce the same harmonic frequency as without the Coulomb force. By numerical solution of the time-dependent Schrödinger equation for a helium model atom, we demonstrate that such a subtle time shift of about 35 attoseconds is measurable by streaking with a weak, orthogonally polarized field combined with a complex-time trajectory interpretation. A comparison of results for high and low streaking frequency shows that only the high-frequency method measures the Coulomb shift well. This is confirmed by a classical trajectory model and by the analytical R-matrix theory.
AB - When an atom is ionized by a strong laser pulse, the field can drive the released electron back to the parent ion and trigger the emission of a high-order harmonic photon with a frequency that is a function of the time of ionization. The attractive Coulomb potential causes a slowdown of the outgoing electron that must be compensated by an earlier release into the accelerating field to produce the same harmonic frequency as without the Coulomb force. By numerical solution of the time-dependent Schrödinger equation for a helium model atom, we demonstrate that such a subtle time shift of about 35 attoseconds is measurable by streaking with a weak, orthogonally polarized field combined with a complex-time trajectory interpretation. A comparison of results for high and low streaking frequency shows that only the high-frequency method measures the Coulomb shift well. This is confirmed by a classical trajectory model and by the analytical R-matrix theory.
UR - http://www.scopus.com/inward/record.url?scp=85129299785&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.105.L041103
DO - 10.1103/PhysRevA.105.L041103
M3 - Article
AN - SCOPUS:85129299785
VL - 105
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 4
M1 - L041103
ER -