English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

High-order above-threshold ionization (HATI) spectrum in IR+XUV two-colorlaser fields has been investigated. We found that the quantum featurescorresponding to the absorption of the XUV photon is well illustrated by apeculiar dip structure in the second plateau of the HATI spectrum. By thechannel analysis, we show that the angular distribution of the spectrum isattributed to the coherent summation over contributions of different channels,and the dip structure in the spectrum is directly related to the absorption ofone XUV photon of the ionized electron during the laser-assisted collision(LAC) with its parent ion in the two-color laser fields. Moreover, by employingthe saddle-point approximation, we obtain the classical energy orbit equation,and find that the dip structure comes from the fact that the LAC is limited ata certain direction by the momentum conservation law as the electron absorbsone XUV photon during the collision, where the probability of the HATI gets itsminimum value. Finally, we find that the interference pattern in the wholespectrum is attributed to the interference of different orbits at collisionmoments $t_0$ and $2\pi/\omega_1-t_0$ in the LAC process.

Photoelectron angular distribution from the high-order above-threshold ionization process in IR+XUV two-color laser fields