Loading...
Multiphoton above-threshold ionization in superintense free-electron x-ray laser fields: Beyond the dipole approximation
Zhou, Zhongyuan Chu, Shih-I
Zhou, Zhongyuan
Chu, Shih-I
Citations
Altmetric:
Abstract
We present an accurate and efficient nondipole computational approach in momentum space for the nonperturbative study of multiphoton above-threshold ionization (ATI) of atoms in superintense and ultrashort-wavelength laser fields. This approach has been successfully used to investigate the multiphoton processes of a hydrogen atom exposed to superintense free-electron x-ray laser fields. We find that, compared to results of the dipole approximation, the nondipole ATI spectra are enhanced substantially in the high-energy regime, and the photoelectron angular distributions are distorted significantly in higher-intensity and/or longer-pulse laser fields; in particular two lobes are induced, one along and one against the laser propagation direction. The origin of these phenomena has been explored in detail.
Description
This is the publisher's version, also available electronically from http://journals.aps.org/pra/abstract/10.1103/PhysRevA.87.023407.
Date
2013-02-13
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Collections
Research Projects
Organizational Units
Journal Issue
Keywords
Citation
Zhou, Zhongyuan; Chu, Shih-I. (2013). "Multiphoton above-threshold ionization in superintense free-electron x-ray laser fields: Beyond the dipole approximation." Physical Review A, 87(2):023407. http://dx.doi.org/10.1103/PhysRevA.87.023407.