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EXAFS Beamline (BL-8) [an error occurred while processing this directive]


Introduction

The Dispersive Extended X-ray Absorption Fine Structure (DEXAFS) beamline has been set up by Applied Spectroscopy Division, BARC at the Indus-2 synchrotron radiation source.
The DEXAFS Beamline (BL08) at Indus-2 is dedicated to X-ray absorption spectroscopy in the transmission mode, using  dispersive optics. In this beamline a bent crystal (Si 111) polychromator is used to select a band of energy from the white synchrotron beam which is horizontally dispersed and focused on the sample. The crystal is bent in the shape of an ellipse in such a way that source & sample positions are at two focii of the ellipse. The transmitted beam intensity from the sample is recorded on a position sensitive CCD detector, thus enabling recording of the whole EXAFS spectrum around an absorption edge in a single shot (typical acquisition time of one spectrum is ~300 msec). A mirror is used prior to the polychromator for vertical focusing and higher harmonics rejection.

Optical layout

Beamline specifications

Source

Bending magnet (2.5 GeV Indus-2 Source)

Energy Range

5-20keV

Acceptance

1.5 mrad horizontal  x  0.2 mrad vertical

 

Pre-Mirror

Rh coated meridional cylindrical mirror with fixed radius of curvature of 1319m, Horizontally mounted for vertical focusing and higher harmonic rejection

Monochromator

Elliptically bent Si(111) Polychromator
Vertically mounted on a mechanical bender
Mean Radius variable between 2 m to 20 m

Post mirror

NA

Observed Spot size @sample position

250microns(H) x 500microns(V) at 20keV

Observed Resolution

5 x 103 @ 20 keV

7.5 x 103 @13 keV

8.5 x 103 @ 11 keV

Photon flux

1012 photons/sec/1000eV bandwidth

Typical acquisition time for one EXAFS spectrum

300 msec

Sample Environment

Mount available for various forms of samples viz., powder, pellets, liquids etc.
High temperature (450º C) reaction cell to study in-situ kinetics for pellet samples

Experimental station

The experimental station consists of a θ-2θ goniometer with a telescopic 2θ arm on which sample and detector stages are mounted. The polychromator is mounted on the θ axis. Both θ and 2 θ motions are independently controlled through a PC. The telescopic arm moves on a granite slab with pneumatic air pads. Sample and detector stages are provided with remote controlled X-Y-Z and tilt mechanisms. Sample stage has facility to mount 12 samples (maximum sample dia: 25mm) at a time; any sample can be brought into the beam path for transmission measurement remotely. Generally samples in pellet or powder form can easily be mounted on the sample holder. Liquid samples confined in a proper cell with x-ray transmission window can also be mounted. A high temperature (upto 750K) cell, which can accommodate sample up to 12mm dia, is available for temperature dependent EXAFS studies. A low temperature sample environment will also be inducted soon in the beamline.

Features

Angular resolution of goniometer 18arcsec
2 θ range -5 to 45 degree
Sample and detector manipulations X, Y (±15mm), Z (-10 to 35mm), tilts(±50)
Sample environment Air/vacuum
Sample temperature range 300 to 750 K

 

Recent EXAFS/XANES Measurements:

S. No.

Samples/ studies

Collaborator

1

Lathanides doped GaOOH

HP&SRPD, BARC

2

Uranium containing adsorbants

M.S. Univ. , Badoda

3

InGaZnO

NCL, Pune

4

Cu-based catalyst attached to mesoporous silica

 

IACS , Kolkata

5

XAFS studies of transition metal (  Cu, Co, Fe, Ni )complexes

DAVV, Indore

6

XAFS studies of BaFeO and Ga2O3

IGCAR, Kalpakkam

7

Doped ZrO2

Chem. Div., BARC

8

Copper complexes

Vikram Univ. Ujjain

9

XANES of Copper compounds

NPD, BARC

10

EXAFS studies of Doped ZnS

Dr. Babasaheb Ambedkar Marathwada University,

Aurangabad

 
EXAFS studies of Eu 3+ doping in GaOOH  nanorods

Publication

  1. A comparative study of the spectra recorded at RRCAT synchrotron BL-8 dispersive EXAFS beamline with other beamlines
    Abhijeet Gaur, B. D. Shrivastava, S. N. Jha, D. Bhattacharyya, &A. Poswal
    Pramana, (2012) In Press.

  2. One-pot thioetherification of aryl halides with thiourea and benzyl bromide in water catalyzed by Cu-grafted furfural imine-functionalized mesoporous SBA-15w
    John Mondal, Arindam Modak, Arghya Dutta, Sohini Basu, Shambhu Nath Jha, Dibyendu Bhattacharyy and Asim Bhaumik
    Chem. Commun., 2012, 48, 8000-8002.

  3. Chemical shifts of K-X-ray absorption edges on copper in different compounds by X-ray absorption spectroscopy (XAS) with Synchrotron radiation
    D. Joseph, S. Basu, S.N. Jha, D. Bhattacharyya
    Nuclear Instruments and Methods in Physics Research B 274, 126-128(2012).

  4. Eu3+ assisted structural collapse of GaOOH nanorods: Probed through EXAFS and vibrational techniques
    S. Basu, B.S. Naidu, M. Pandey, V. Sudarsan, S.N. Jha, D. Bhattacharyya, R.K. Vatsa, R.J. Kshirsagar
    Chem. Phys. Lett. 528 (2012)21.

  5. X-ray Absorption Spectroscopy of doped ZrO2 systems
    S. Basua, Salil Varma, A.N. Shirsatb, B.N. Wani, S. R. Bharadwaj, A. Chakrabarti, S.N. Jha and D. Bhattacharyya
    Journal of Applied Physics, 111 (2012) 053532.

  6. EXAFS measurements on PbMoO4 crystals prepared under different conditions
    A.K. Poswal, D. Bhattacharyya, S.N. Jha, Sangeeta and S.C. Sabharwal
    Bull. Mater. Sci., 35 (2012) 103.

  7. On the method of calibration of the energy dispersive EXAFS beamline at Indus-2 and fitting theoretical model to the EXAFS spectrum
    Abhijeet Gaur, Ajita Johari, B. D. Shrivastava, D. C. GAUR, S. N. Jha, D. Bhattacharyya, A. Poswal and S. K. Deb
    Sadhana, 36, 339-348(2011).

  8. EXAFS study of binuclear hydroxo-bridged copper(II) complexes
    Abhijeet Gaur, B. D. Shrivastava, D. C. Gaur, J. Prasad, K. Srivastava, S. N. Jha, D. Bhattacharyya, A. Poswal and S. K. Deb
    Journal of Coordination Chemistry, Vol. 64, 1265-1275(2011).

  9. X-ray absorption spectroscopy of PbMoO4 single crystals
    D. Bhattacharyya, A.K. Poswal, S.N. Jha, Sangeeta and S.C. Sabharwal
    Bull. Mater. Sci., 32, 1-5( 2009).

  10. First Results From a Dispersive EXAFS beamline developed at INDUS-2 Synchrotron Source at RRCAT, Indore, India
    D.Bhattacharyya, A.K.Poswal, S.N.Jha, Sangeeta and S.C.Sabharwal
    Nuclear Instruments and Methods in Physics Research A, 609, 286-293(2009).

  11. Focussing properties of Energy Dispersive EXAFS Beamline at INDUS-2 SRS using Aditional Optical Elements
    N.C. Das, D. Lahiri and D.Bhattacharyya
    Journal of Optics, 36 (2007) 8.

  12. Optimisation of cooling configuration of different components of the EXAFS beamline at INDUS-II Synchrotron source
    D.Bhattacharyya, S.N. Jha, N.C. Das, Vishnu Verma, S.G. Markandeya and A.K. Ghosh, Sadhana
    30 (2005) 735

  13. Design, Fabrication and Testing of Elliptical Crystal Bender for the EXAFS Beam Line at INDUS-II Synchrotron Source
    N.C.Das, S.N.Jha, D.Bhattacharyya, A.K. Poswal, A.K.Sinha and V.K.Mishra, Sadhana
    29 (2004) 545.

  14. Design of the Extended X-ray Absorption Fine-Structure (EXAFS) Beam Line at INDUS-II Synchrotron source
    N.C. Das, S.N. Jha, and D.Bhattacharyya
    AIP Conference Proceedings of Eighth International conference on Synchrotron Radiation Instrumentation (SRI-2003), Aug 24-Aug 29, 2003, San Francisco, USA, Vol.705, 179-186, 2003.


Contact Number : 244 2508/ 244 2104

Contacts

Dr. M. N. Deo mndeo(at)barc.gov.in Applied Spectroscopy Division Bhabha Atomic Research Centre, Mumbai – 400 085 .
Dr. D. Bhattacharyya dibyendu(at)barc.gov.in
Sh. A.K. Poswal anshu(at)barc.gov.in
Dr. S.N. Jha snjha(at)rrcat.gov.in Raja Ramanna Centre for Advanced Technology, Indore – 452 013
     
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