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XANES and EXAFS of dilute solutions of transition metals at XFELs
Lawrence Berkeley Natl Lab, Mol Biophys & Integrated Bioimaging Div, 1 Cyclotron Rd, Berkeley, CA 94704 USA.
SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA.
SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA.
Lawrence Berkeley Natl Lab, Mol Biophys & Integrated Bioimaging Div, 1 Cyclotron Rd, Berkeley, CA 94704 USA.ORCID iD: 0000-0001-8920-8737
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2019 (English)In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 26, p. 1716-1724Article in journal (Refereed) Published
Abstract [en]

This work has demonstrated that X-ray absorption spectroscopy (XAS), both Mn XANES and EXAFS, of solutions with millimolar concentrations of metal is possible using the femtosecond X-ray pulses from XFELs. Mn XAS data were collected using two different sample delivery methods, a Rayleigh jet and a drop-on-demand setup, with varying concentrations of Mn. Here, a new method for normalization of XAS spectra based on solvent scattering that is compatible with data collection from a highly variable pulsed source is described. The measured XANES and EXAFS spectra of such dilute solution samples are in good agreement with data collected at synchrotron sources using traditional scanning protocols. The procedures described here will enable XFEL-based XAS on dilute biological samples, especially metalloproteins, with low sample consumption. Details of the experimental setup and data analysis methods used in this XANES and EXAFS study are presented. This method will also benefit XAS performed at high-repetition-rate XFELs such as the European XFEL, LCLS-II and LCLS-II-HE.

Place, publisher, year, edition, pages
INT UNION CRYSTALLOGRAPHY , 2019. Vol. 26, p. 1716-1724
Keywords [en]
X-ray free electron lasers, X-ray near-edge spectroscopy, extended X-ray absorption fine structure, X-ray absorption spectroscopy
National Category
Atom and Molecular Physics and Optics Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-394695DOI: 10.1107/S1600577519007550ISI: 000484666200037PubMedID: 31490163OAI: oai:DiVA.org:uu-394695DiVA, id: diva2:1362920
Funder
Swedish Energy Agency, 2016-05183Swedish Research Council, 2016-05183Swedish Research Council, 2017-00356Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-10-22Bibliographically approved

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