High-resolution absorption measurements with free-electron lasers using ghost spectroscopy

Klein, Yishay; Strizhevsky, E.; Capotondi, Flavio; Angelis, Dario De; Giannessi, L.; Pancaldi, Matteo; Pedersoli, Emanuele; Sefi, O.; Kim, Young Yong; Vartanyants, Ivan A.; Shwartz, Sharon

doi:10.1364/ls.2022.lw7f.4

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Spectrographs with ultra-high spectral resolution, ultra-high wavelength accuracy, wide spectral range, and fast data acquisition capability show great potential in a wide range of scientific frontiers, such as high-resolution astronomical observations [1,2] , space spectral detections [3,4] , laser measurements [5,6] and Raman/Brillouin spectroscopy [7,8] , etc. Usually, the resolution of a dispersive spectrograph is determined by the main dispersion element of the spectrograph.…”

Section: Introductionmentioning

confidence: 99%

Performance verification of ultra-high-resolution VIPA-based spectrograph with resolution >50k and spectral range >80nm

Zhang,

Lin,

Zhu

et al. 2023

Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manu

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Section: Introductionmentioning

confidence: 99%

Performance verification of ultra-high-resolution VIPA-based spectrograph with resolution >50k and spectral range >80nm

Zhang,

Lin,

Zhu

et al. 2023

Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manu

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Photon energy-resolved velocity map imaging from spectral domain ghost imaging

Wang

Driver²,

Allum³

et al. 2023

New J. Phys.

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We present an approach that combines photon spectrum correlation analysis with the reconstruction of three-dimensional momentum distribution from velocity map images in an efficient, single-step procedure.We demonstrate its efficacy with the results from the photoionization of the 2p-shell of argon using the FLASH free-electron laser (FEL). Distinct spectral features due to the spin-orbit splitting of Ar+(2p-1) are resolved, despite the large average bandwidth of the ionizing pulses from the FEL.This demonstrates a clear advantage over the conventional analysis method, and it will be broadly beneficial for velocity map imaging experiments with FEL sources.The retrieved linewidth of the binding energy spectrum approaches the resolution limitation prescribed by the spectrometers used to collect the data.Our approach presents a path to extend spectral-domain ghost imaging to the case where the photoproduct observable is high-dimensional.

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Progress and Perspectives of Spectroscopic Studies on Carbon K-Edge Using Novel Soft X-ray Pulsed Sources

et al. 2022

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The development of novel coherent and brilliant sources, such as soft X-ray free electron laser (FEL) and high harmonic generation (HHG), enables new ultrafast analysis of the electronic and structural dynamics of a wide variety of materials. Soft X-ray FEL delivers high-brilliance beams with a short pulse duration, high spatial coherence and photon energy tunability. In comparison with FELs, HHG X-ray sources are characterized by a wide spectral bandwidth and few- to sub-femtosecond pulses. The approach will lead to the time-resolved reconstruction of molecular dynamics, shedding light on different photochemical pathways. The high peak brilliance of soft X-ray FELs facilitates investigations in a nonlinear regime, while the broader spectral bandwidth of the HHG sources may provide the simultaneous probing of multiple components. Significant technical breakthroughs in these novel sources are under way to improve brilliance, pulse duration, and to control spectral bandwidth, spot size, and energy resolution. Therefore, in the next few years, the new generation of soft X-ray sources combined with novel experimental techniques, new detectors, and computing capabilities will allow for the study of several extremely fast dynamics, such as vibronic dynamics. In the present review, we discuss recent developments in experiments, performed with soft X-ray FELs and HHG sources, operating near the carbon K-absorption edge, being a key atomic component in biosystems and soft materials. Different spectroscopy methods such as time-resolved pump-probe techniques, nonlinear spectroscopies and photoelectron spectroscopy studies have been addressed in an attempt to better understand fundamental physico-chemical processes.

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High-resolution absorption measurements with free-electron lasers using ghost spectroscopy

Abstract: We demonstrate a fast, simple, and high-resolution absorption spectroscopy approach for high photon energies with free-electron laser sources. The method fosters new possibilities for measurements of absorption spectra in complex samples especially for photo-induced phenomena.

Cited by 3 publications

References 4 publications

Performance verification of ultra-high-resolution VIPA-based spectrograph with resolution >50k and spectral range >80nm

Performance verification of ultra-high-resolution VIPA-based spectrograph with resolution >50k and spectral range >80nm

Photon energy-resolved velocity map imaging from spectral domain ghost imaging

Progress and Perspectives of Spectroscopic Studies on Carbon K-Edge Using Novel Soft X-ray Pulsed Sources

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