FLASH: The First Superconducting X-Ray Free-Electron Laser

Rossbach, Joerg

doi:10.1007/978-3-030-23201-6_10

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…For this, photoelectron sidebands will be used as an example [56]. We will base the discussion on the actual experimental pump-probe photoelectron spectra collected at the CAMP end-station [57,58] of the soft X-ray free-electron laser FLASH (DESY, Hamburg) [59,60] during the beamtime F-20191568. In this experiment, helium (He) atoms were pumped with XUV photons with an energy of hν XUV = 40.8 eV (wavelength λ = 30.3 nm), produced by FLASH, and then probed by infrared (IR) photons with an energy of hν IR = 1.5 eV (λ = 810 nm).…”

Section: Multiple Datasets With Shared Parametersmentioning

confidence: 99%

Inverse Problems in Pump–Probe Spectroscopy

Tikhonov,

Garg,

Schnell

2024

Photochem

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Ultrafast pump–probe spectroscopic studies allow for deep insights into the mechanisms and timescales of photophysical and photochemical processes. Extracting valuable information from these studies, such as reactive intermediates’ lifetimes and coherent oscillation frequencies, is an example of the inverse problems of chemical kinetics. This article describes a consistent approach for solving this inverse problem that avoids the common obstacles of simple least-squares fitting that can lead to unreliable results. The presented approach is based on the regularized Markov Chain Monte-Carlo sampling for the strongly nonlinear parameters, allowing for a straightforward solution of the ill-posed nonlinear inverse problem. The software to implement the described fitting routine is introduced and the numerical examples of its application are given. We will also touch on critical experimental parameters, such as the temporal overlap of pulses and cross-correlation time and their connection to the minimal reachable time resolution.

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Section: Multiple Datasets With Shared Parametersmentioning

confidence: 99%

Inverse Problems in Pump–Probe Spectroscopy

Tikhonov,

Garg,

Schnell

2024

Photochem

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Pump–probe capabilities at the SPB/SFX instrument of the European XFEL

Koliyadu¹,

Letrun²,

Kirkwood³

et al. 2022

J Synchrotron Rad

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Pump–probe experiments at X-ray free-electron laser (XFEL) facilities are a powerful tool for studying dynamics at ultrafast and longer timescales. Observing the dynamics in diverse scientific cases requires optical laser systems with a wide range of wavelength, flexible pulse sequences and different pulse durations, especially in the pump source. Here, the pump–probe instrumentation available for measurements at the Single Particles, Clusters, and Biomolecules and Serial Femtosecond Crystallography (SPB/SFX) instrument of the European XFEL is reported. The temporal and spatial stability of this instrumentation is also presented.

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FLASH: The First Superconducting X-Ray Free-Electron Laser

Cited by 2 publications

References 25 publications

Inverse Problems in Pump–Probe Spectroscopy

Inverse Problems in Pump–Probe Spectroscopy

Pump–probe capabilities at the SPB/SFX instrument of the European XFEL

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