Augmentation of the step‐by‐step Energy‐Scanning EXAFS beamline BL‐09 to continuous‐scan EXAFS mode at INDUS‐2 SRS. (7th October 2016)

• Record Type: Journal Article
• Authors: Poswal, Ashwini Kumar; Agrawal, Ankur; Poswal, Himanshu Kumar; Bhattacharyya, Dibyendu; Jha, Shambhu Nath; Sahoo, Naba Kishore
• Is Part Of: Journal of synchrotron radiation. Volume 23:Part 6(2016)
• Page Start: 1518
• Page End: 1525
• Publication Date: 2016-10-07
• Subjects: time‐resolved EXAFS -- chemical processes -- quick‐XAS -- time‐resolved EXAFS; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S160057751601362X
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : An innovative scheme to carry out continuous X‐ray absorption spectroscopy measurements similar to quick‐EXAFS mode at the step‐by‐step Energy‐Scanning EXAFS beamline BL‐09 at the INDUS‐2 synchrotron source is presented. Abstract : An innovative scheme to carry out continuous‐scan X‐ray absorption spectroscopy (XAS) measurements similar to quick‐EXAFS mode at the Energy‐Scanning EXAFS beamline BL‐09 at INDUS‐2 synchrotron source (Indore, India), which is generally operated in step‐by‐step scanning mode, is presented. The continuous XAS mode has been implemented by adopting a continuous‐scan scheme of the double‐crystal monochromator and on‐the‐fly measurement of incident and transmitted intensities. This enabled a high signal‐to‐noise ratio to be maintained and the acquisition time was reduced to a few seconds from tens of minutes or hours. The quality of the spectra (signal‐to‐noise level, resolution and energy calibration) was checked by measuring and analysing XAS spectra of standard metal foils. To demonstrate the energy range covered in a single scan, a continuous‐mode XAS spectrum of copper nickel alloy covering both Cu and Ni K ‐edges was recorded. The implementation of continuous‐scan XAS mode at BL‐09 would expand the use of this beamline in in situ time‐resolved XAS studies of various important systems of current technological importance. The feasibility of employing this mode of measurement for time‐resolved probing of reaction kinetics has been demonstrated by in situ XAS measurement on the growth of Ag nanoparticles from a solution phase.