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Appl. Sci. 2017, 7(7), 653; doi:10.3390/app7070653

State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses

1
Institute of Physics, Jan Kochanowski University, Kielce 25-001, Poland
2
Physikalisch-Technische Bundesanstalt (PTB), Berlin 10587, Germany
3
Paul Scherrer Institute, Villigen 5232, Switzerland
4
Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw 01-224, Poland
5
Department of Chemistry-Ånsgtröm Laboratory, Uppsala University, Uppsala 752 36, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Kiyoshi Ueda
Received: 29 April 2017 / Revised: 16 June 2017 / Accepted: 21 June 2017 / Published: 24 June 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
View Full-Text   |   Download PDF [1370 KB, uploaded 24 June 2017]   |  

Abstract

We report on studies of state-populations during the two-photon absorption process using intense X-ray pulses. The calculations were performed in a time-dependent manner using a simple three-level model expressed by coupled rate equations. We show that the proposed approach describes well the measured rates of X-rays excited in the one-photon and two-photon absorption processes, and allows detailed investigation of the state population dynamics during the course of the incident X-ray pulse. Finally, we demonstrate that the nonlinear interaction of X-ray pulses with atoms leads to a time-narrowing of state populations. This narrowing-effect is attributed to a quadratic incidence X-ray intensity dependence characteristic for nonlinear interactions of photons with matter. View Full-Text
Keywords: X-ray nonlinear processes; two-photon absorption; rate equations X-ray nonlinear processes; two-photon absorption; rate equations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tyrała, K.; Wojtaszek, K.; Pajek, M.; Kayser, Y.; Milne, C.; Sá, J.; Szlachetko, J. State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses. Appl. Sci. 2017, 7, 653.

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