title: Augmentation of the step-by-step Energy-Scanning EXAFS beamline BL-09 to continuous-scan EXAFS mode at INDUS-2 SRS.
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.
authors: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: Ashwini Kumar
authors: AK
authors: Poswal
authors: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: Ankur
authors: A
authors: Agrawal
authors: High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: Himanshu Kumar
authors: HK
authors: Poswal
authors: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: Dibyendu
authors: D
authors: Bhattacharyya
authors: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: Shambhu Nath
authors: SN
authors: Jha
authors: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors: Naba Kishore
authors: NK
authors: Sahoo
keywords: chemical processes.; quick-XAS; time-resolved EXAFS