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Strong-field approximation and its modifications as evolution equations

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Ivanov,  Igor
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Ivanov, I., Nam, C. H., & Kim, K. T. (2019). Strong-field approximation and its modifications as evolution equations. Physical Review A, 99(1): 013417. doi:10.1103/PhysRevA.99.013417.


Cite as: http://hdl.handle.net/21.11116/0000-0002-E44A-A
Abstract
We describe an approach based on the view of the well-known strong-field approximation (SFA) as an evolution equation. From this point of view the SFA is a nonhomogeneous evolution equation with the inhomogeneous term which determines the departure of the approximate evolution driven by the SFA from the evolution driven by the exact ab initio time-dependent Schrodinger equation (TDSE). A modification of this nonhomogeneous evolution equation making the inhomogeneous term smaller produces results for the photoelectron spectra which agree quantitatively well with the TDSE results for a system with the Coulomb interaction (we use hydrogen as an example).