Welcome to Spectroscopy
X-ray spectroscopy is a powerful tool for the determination of local atomic structure in materials not characterised by crystalline order. The Spectroscopy Village incorporates five beamlines, three of which are currently operational and two in the design and construction phase. The suite of operational beamlines consists of the Core Extended X-ray Absorption Fine Structure (EXAFS) beamline B18; the Microfocus Spectroscopy beamline I18; and the Versatile X-ray Absorption Spectroscopy beamline I20-LOLA. The Scanning X-ray Microscopy beamline I08-SXM welcomed first users in summer 2014 and is currently in optimisation phase. The Hard X-ray Nanoprobe for complex systems beamline I14 is in the design phase, with first users expected for 2017. Both beamlines add unprecedent imaging and spectromicroscopy features to the Village. The development of the Spectroscopy Village is ongoing, ensuring that there is a wide variety of imaging and spectromicroscopy techniques available, as described within these pages.
X-ray absorption spectroscopy (XAS) is a technique for determining the local electronic and geometric structure of matter. XAS includes techniques such as XANES and EXAFS, among others.
X-ray fluorescence (XRF) is the emission of secondary X-rays from matter, which is widely used for analyzing the elemental distribution or spectroscopy with highest chemical sensitivity.
Organic or inorganic heterogeneous matter attenuates and scatters X-rays in different manner, which is used to characterize the morphology of the specimen using a variety of contrast techniques.
X-ray diffraction makes use of scattered X-ray that constructively interfere and give a unique fingerprint of the specimen and its structure and phases.
Small-angle X-ray scattering (SAXS) is a technique where the elastic scattering of X-rays is recorded to provide information on the shape and size of partially ordered systems.
µX-ray absorption spectroscopy, µX-ray fluorescence imaging and µdiffraction using high-brightness focused X-ray beam. Other techniques available include X-ray Excited Optical Luminescence (XEOL), X-ray Fluorescence Tomography, Fluorescence ReflEXAFS, Differential Phase Contrast Imaging.
Beamsize: 2 x 2.5 µm2
Energy: 2.05 - 20.5 keV
B18 is a general purpose EXAFS beamline. The Core-EXAFS is used for an extensive range of studies and applications, including local structure and electronic state of active components, and the study of materials including fluids, crystalline and non-crystalline (amorphous phases & colloids) solids, surfaces and biomaterials.
Beamsize: 200 x 250 µm2
Energy: 2.05 - 35 keV
I20 covers three very distinctive modes of operation: X-ray Absorption Spectroscopy (XAS) on challenging samples, X-ray Emission Spectroscopy (XES), and Energy Dispersive EXAFS (EDE). The beamline is equipped with two wigglers in the same straight section, one for the scanning branchline (I20-scanning) and the other for the dispersive branch (I20-EDE).
Beamsize: I20-scanning: 400 x 300 µm2 / I20-EDE: 50 x 60 µm2
Energy: I20-scanning: 4 - 34 keV / I20-EDE: 6 - 26 keV
Scanning X-ray Microscopy with variety of imaging and spectomicroscopy modes: Transmission incl. absorption and phase-sensitive contrasts, X-ray fluorescence as well as soft X-ray diffraction imaging (ptychography).
Beamsize: 20 nm (depends on imaging modes)
Energy: 0.25 - 4.2 keV
Beamsize: 25 nm
Energy: 5 - 25 keV
I21 will be a dedicated Resonant Inelastic X-ray Scattering (RIXS) beamline that will provide a highly monochromatised, focused and tunable X-ray beam onto materials, while detecting and energy-analysing scattered X-rays using a spatially-resolved two-dimensional detector.
Beamsize: 40 x 3 µm2
Energy: 0.20 - 3.0 keV
|Energy range (keV) ||0.25 - 4.2||5 - 25||5.5 - 19.5||2.05 - 20.5|| |
|0.2 - 3|
|Flux (ph/s) at sample (300 mA)||5x109 - 5x1010||2 x 1012|| |
I20-scanning: >5x1012 (Si(111) at 10 keV)
I20-EDE: >1012 (10% bandpass)
|> 5 x 10^|
|Beam size at sample|| |
0.02 -0.1 µm (depending on imaging mode)
|0.025 µm||200 µm (V) x 250 µm (H)||2 µm (V) x 2 µm (H)|| |
|3 x 50|
|Time resolution||> 1ms|| I20-EDE: |
|Specimen environments||kinematic dry cell, LN2 cryo specimen cells, various functional in-situ cells||LN2/ LHe Cryostat, He chamber, LN2 cryostream, Furnaces to 1400 C||LN2 and He pulse tube cryostats, LN2 cryostream, gas capillary cell, furnace reactor||LN2/LHe Cryostat|