期刊
PHYSICAL REVIEW A
卷 79, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.053411
关键词
ab initio calculations; atom-photon collisions; high-speed optical techniques; laser beam effects; neon; photoionisation; two-photon processes; wave functions
资金
- Engineering and Physical Sciences Research Council [EP/E000223/1]
- EPSRC [EP/E000223/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E000223/1] Funding Source: researchfish
We describe an ab initio nonperturbative time-dependent R-matrix theory for ultrafast atomic processes. This theory enables investigations of the interaction of few-femtosecond and -attosecond pulse lasers with complex multielectron atoms and atomic ions. A derivation and analysis of the basic equations are given, which propagate the atomic wave function in the presence of the laser field forward in time in the internal and external R-matrix regions. To verify the accuracy of the approach, we investigate two-photon ionization of Ne irradiated by an intense laser pulse and compare current results with those obtained using the R-matrix Floquet method and an alternative time-dependent method. We also verify the capability of the current approach by applying it to the study of two-dimensional momentum distributions of electrons ejected from Ne due to irradiation by a sequence of 2 as light pulses in the presence of a 780 nm laser field.
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