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State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses
Institute of Physics, Jan Kochanowski University.
Institute of Physics, Jan Kochanowski University.
Institute of Physics, Jan Kochanowski University.
Physikalisch-Technische Bundesanstalt (PTB).
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2017 (English)In: Applied Sciences: APPS, ISSN 1454-5101, E-ISSN 1454-5101, Vol. 7, no 7, article id 653Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 7, no 7, article id 653
Keywords [en]
X-ray nonlinear processes, two-photon absorption, rate equations
National Category
Materials Chemistry Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-334100DOI: 10.3390/app7070653ISI: 000407700400010OAI: oai:DiVA.org:uu-334100DiVA, id: diva2:1158930
Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-29Bibliographically approved

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