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Wave‐function splitting technique for calculating above‐threshold ionization electron spectra
Author(s) -
Chelkowski S.,
Bandrauk A. D.
Publication year - 1996
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/(sici)1097-461x(1996)60:7<1685::aid-qua51>3.0.co;2-x
Subject(s) - ionization , spectral line , wave function , atomic physics , electron , function (biology) , physics , ionization energy , computational physics , quantum mechanics , ion , evolutionary biology , biology
In intense laser fields, atoms and molecules can absorb many more photons than required for ionization. This phenomenon is called above‐threshold ionization (ATI) and it shows up in kinetic energy spectra of ionized electrons. The presence of very high energy photoelectrons necessitates the use of extremely large grids in numerical simulations based on the full time‐dependent Schrödinger equation. We show that by using a wave function splitting scheme one can circumvent the problem of large grids and thus obtain accurate multiphoton photoelectron spectra. This scheme will be very useful in studies of ATI spectra generated by molecules in intense laser fields. We illustrate this method for a one‐dimensional model of the H atom in intense laser fields. © 1996 John Wiley & Sons, Inc.