VESPERS is a hard X-ray microprobe beamline capable of providing a high level of complementary structural and analytical information. The techniques of X-ray diffraction and X-ray fluorescence spectroscopy are employed to analyze a microscopic volume in the sample, as well as X-ray absorption spectroscopy. Multi-bandpass and pink beam capability are built in to meet various requirements. A mm-sized beam is also available for the experiments.

VESPERS beamline uses a bending magnet source on Port 07B2-1 at CLS. It is designed to have a two-branch capability which allows two branch lines to be operated independently while sharing one monochromator. Currently, only one branch is in operation. The figure here shows a schematic layout of one branch of the beamline.




Source Bending Magnet
Spectral Range 6 – 30 keV
Resolution Si-111: 10⁻⁴, MLM1: 10⁻² , MLM2: 10⁻¹, Polychromatic Beam (Pink Beam)
Spot Sizes 2 μm to 4 μm (mm-sized beam also available)
Photon Flux Si-111: 2x10⁹, MLM1: 1x10¹¹, MLM2: 4x10¹¹ (@15 keV and 100 mA)


  • X-Ray Fluorescence Spectroscopy (XRF)
  • X-Ray Diffraction (XRD)
  • X-Ray Laue Diffraction
  • X-Ray Absorption Spectroscopy (XAS/XANES/XAFS)
  • Micro XAFS and XRD/XRF Imaging
  • Differential Aperture X-Ray Microscopy (DAXM)
  • X-Ray Excited Optical Luminescence (XEOL)