Journal Article

PUBDB-2022-07537

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Decreasing ultrafast X-ray pulse durations with saturable absorption and resonant transitions

Cardoch, S. (Corresponding author)Extern*XFEL.EU* ; Trost, F.CFEL*DESY* ; Scott, H.Extern*XFEL.EU* ; Chapman, H. N.CFEL*XFEL.EU*DESY* ; Caleman, C.CFEL*DESY* ; Timneanu, N. (Corresponding author)Extern*

2023
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevE.107.015205  doi:10.3204/PUBDB-2022-07537

Abstract: Saturable absorption is a nonlinear effect where a material’s ability to absorb light is frustrated due to a high influx of photons and the creation of electron vacancies. Experimentally induced saturable absorption in copper revealed a reduction in the temporal duration of transmitted X-ray laser pulses, but a detailed account of changes in opacity and emergence of resonances is still missing. In this computational work, we employ non-local thermodynamic equilibrium plasma simulations to study the interaction of femtosecond X-rays and copper. Following the onset of frustrated absorption, we find that a K–M resonant transition occurring at highly charged states turns copper opaque again. The changes in absorption generate a transient transparent window responsible for the shortened transmission signal. We also propose using fluorescence induced by the incident beam as an alternative source to achieve shorter X-ray pulses. Intense femtosecond X-rays are valuable to probe the structure and dynamics of biological samples or to reach extreme states of matter. Shortened pulses could be relevant for emerging imaging techniques.

Note: ISSN 2470-0053 not unique: **2 hits**.

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Contributing Institute(s):

1. FS-CFEL-1 Fachgruppe CFEL-Infrastrukt. (FS-CFEL-1-CFEL)
2. CFEL-Coherent X-Ray Imaging (FS-CFEL-1)

Research Program(s):

1. 633 - Life Sciences – Building Blocks of Life: Structure and Function (POF4-633) (POF4-633)
2. DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
3. DFG project 194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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