In-house time-resolved photocrystallography on the millisecond timescale using a gated X-ray hybrid pixel area detector - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Crystallographica Section B : Structural Science, Crystal Engineering and Materials [2014-...] Année : 2017

In-house time-resolved photocrystallography on the millisecond timescale using a gated X-ray hybrid pixel area detector

Résumé

With the remarkable progress of accelerator-based X-ray sources in terms of intensity and brightness, the investigation of structural dynamics from time-resolved X-ray diffraction methods is becoming widespread in chemistry, biochemistry and materials science applications. Diffraction patterns can now be measured down to the femtosecond timescale using X-ray free electron lasers or table-top laser plasma X-ray sources. On the other hand, the recent developments in photon counting X-ray area detectors offer new opportunities for time-resolved crystallography. Taking advantage of the fast read-out, the internal stacking of recorded images, and the gating possibilities (electronic shutter) of the XPAD hybrid pixel detector, we implemented a laboratory X-ray diffractometer for time-resolved single-crystal X-ray diffraction after pulsed laser excitation, combined with transient optical absorption measurement. The experimental method and instrumental setup are described in detail, and validated using the photoinduced nitrosyl linkage isomerism of sodium nitroprusside, Na 2 [Fe(CN) 5 NO]Á2H 2 O, as proof of principle. Light-induced Bragg intensity relative variations ÁI(hkl)/I(hkl) of the order of 1%, due to the photoswitching of the NO ligand, could be detected with a 6 ms acquisition window. The capabilities of such a laboratory time-resolved experiment are critically evaluated.
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Dates et versions

hal-01709681 , version 1 (15-02-2018)
hal-01709681 , version 2 (29-07-2019)

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Nicolas Casaretto, Dominik Schaniel, Paul Alle, Emmanuel Wenger, Pascal Parois, et al.. In-house time-resolved photocrystallography on the millisecond timescale using a gated X-ray hybrid pixel area detector. Acta Crystallographica Section B : Structural Science, Crystal Engineering and Materials [2014-..], 2017, 73 (4), pp.696 - 707. ⟨10.1107/S2052520617009234⟩. ⟨hal-01709681v2⟩
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