PIPOXS Beamline (ID2A)

X-ray spectroscopic studies of geometric and valence electronic structure in catalytic systems and functional materials.

Learn more about the PIPOXS beamline

Barrel Spectrometer

The "barrel" spectrometer - CHESS engineered large solid angle dispersive spectrometer allows an entire x-ray emission spectrum to be collected at once.  This spectrometer is ideal for time-resolved studies and rapid collection of two-dimensional data.

Beamline Status

Description: The PIPOXS beamline is optimized for x-ray spectroscopic studies of the geometric and valence electronic structures of catalytic systems and functional materials.  We offer the ability to perform transmission and fluorescence x-ray absorption spectroscopy (XAS) and EXAFS, non-resonant and resonant x-ray emission spectroscopy (XES), and high energy resolution fluorescence detected (HERFD) XAS, all at ~1 eV resolution.
Lead Scientist: Chris Pollock (email)
Beamline capabilities:
  • Wide incident energy range enables access to all K-edges from calcium to erbium and all L-edges from antimony to uranium
  • Choice of high flux Si(111) and high resolution Si(311) monochromator
  • Continuous monochromator “flyscanning” allows XANES spectra to be collected in as little as 10 s and EXAFS in as little as 30 s
  • Temperature control from 10 K to room temperature using displex and LN2 flow cryostats
  • In-hutch gas handling allows operando reactions using gaseous reactants to be monitored
  • Beamline-based microfluidic system enables observation of solution-phase chemical reactions
  • Two-color scanning XES spectrometer allows for x-ray emission data collection from two elements simultaneously
  • Dispersive spectrometer allows continuous collection of an entire emission spectrum
  • Most techniques are available as remote / mail-in experiments
Monochromators:
  • Si(111) for 4.0 - 30 keV
  • Si(311) for 7.0 - 58 keV
Spot Size: Adjustable from 2 mm (h) x 1 mm (v) down to 400 μm (h) x 100 μm (v)
Detectors:
  • Ion chambers with nitrogen or argon
  • Four-element Vortex detector for fluorescence
  • Pilatus 100K detectors for XES on DAVES
  • Eiger 1M detector for dispersive XES on the barrel spectrometer
Sample Environments:

PIPOXS has the ability to accommodate a wide variety of user-provided sample environments.  The list below details the environments and equipment provided by CHESS:

  • Displex cryostat (15 K - 300 K)
  • Liquid nitrogen flow cryostat (80 K - 300 K)
  • Biologic potentiostat
  • Selection of gasses available for delivery to the sample
Access Modes:

In Person:  In this mode the user comes to the beamline with their samples and conducts the work on site.  All experiments and sample environments are available in this mode.

Remote:  In this mode the user sends sample to CHESS and then controls the beamline remotely using a NoMachine connection.  CHESS staff will perform sample changes on a schedule determined with the user.  Some sample environments (e.g. operando chemical reactions) are not available as remote experiments.

Mail In:  In this mode the user sends samples to CHESS and CHESS staff will collect data without the need for user involvement.  Sample environments other than static conditions are not available for mail in experiments; certain techniques may also not be supported depending on staff availability.
Analyzer Crystals: Currently Available
Beamline Wiki: https://wiki.classe.cornell.edu/CHESS/Operations/ID2A