Interference effects in one- and two-photon ionization by femtosecond VUV pulses

Gryzlova, E.V.; Staroselskaya, E.I.; Grum-Grzhimailo, A.N.; Venzke, J.; Bartschat, K.

Авторы: Gryzlova E.V., Staroselskaya E.I., Grum-Grzhimailo A.N., Venzke J., Bartschat K.
Сборник: Bulletin of the American Physical Society
Серия: 46th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics; Monday–Friday, June 8–12, 2015; Columbus, Ohio
Том: 60
Тезисы
Год издания: 2015
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 180
Последняя страница: 181
Аннотация: Investigations of coherent control of atomic and molecular processes have rapidly developed since the advent of coherent light sources such as X-ray free electron lasers (XFELs) and achievements in high harmonic generation. In practice, radiation from XFELs contains a small fraction of the second harmonic, which is difficult to filter out but can strongly influence experimental data on the two-photon ionization process, such as the angular distribution. Specifically, the direct first-order second-harmonic ionization process may interfere with, and possibly even dominate a second-order two-photon process caused by the fundamental. While this interference has been investigated in the optical regime with many-cycle pulses, possible effects due to short pulses, as well as a physical intermediate resonance state that may serve as a stepping stone for the second-order process, need a careful study for particular experimental conditions. Here we consider the photoionization of atomic hydrogen for photon energies near the excitation energy of the 2p state (0.375 a.u. or 121.6 nm). We compare results obtained from a direct numerical solution of the time-dependent Schroedinger equation and second-order perturbation theory. This work is supported by the United States National Science Foundation under grant No. PHY-1430245 and the XSEDE allocation PHY-090031, and by the Russian Foundation for Basic Research under Grant No. 12-02-01123.
Добавил в систему: Грум-Гржимайло Алексей Николаевич

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Interference effects in one- and two-photon ionization by femtosecond VUV pulsesтезисы доклада

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