Long-time solution of the time-dependent Schroedinger equation for an atom in an electromagnetic field using complex coordinate contours
We demonstrate that exterior complex scaling (ECS) can be used to impose outgoing wave boundary conditions exactly on solutions of the time-dependent Schrodinger equation for atoms in intense electromagnetic pulses using finite grid methods. The procedure is formally exact when applied in the appropriate gauge and is demonstrated in a calculation of high harmonic generation in which multiphoton resonances are seen for long pulse durations. However, we also demonstrate that while the application of ECS in this way is formally exact, numerical error can appear for long time propagations that can only be controlled by extending the finite grid. A mathematical analysis of the origins of that numerical error, illustrated with an analytically solvable model, is also given.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Chemical Sciences Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 983154
- Report Number(s):
- LBNL-3285E; PLRAAN; TRN: US1004562
- Journal Information:
- Physical Review A, Vol. 80; Related Information: Journal Publication Date: December 2009; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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