RSoXS Endstation

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About the SST-1 RSoXS Endstation

The Resonant Soft X-ray Scattering (RSoXS) station is the furthest upstream measurement station on the soft branch of the SST-1, SST-2 beamline suite. Initially funded by an award from the NIST Innovations in Measurement Science (IMS) competition in 2018, and operational since 2019, the SST-1 RSoXS station is the newest world-leading facility for RSoXS. The RSoXS station is generally used to measure soft materials and specializes in measurements at the Carbon K X-ray absorption edge, where recent advances have lead to a nearly flat spectrum of X-rays. To learn more about RSoXS and NIST's RSoXS endstation in particular, please explore this wiki, and email the beamline scientist, Eliot Gann if you have any questions.

The next deadline for proposals (Cycle 2024-1 [Jan-Apr]) is Saturday, Sept 30, 2023 11:59 Eastern Time.

Technical Specifications

(see the beamline instrument paper for more details)

  • Beamsize: 250 µm (vertical FWHM) by 350 µm (horizontal FWHM)
  • Detector: 4k x 4k Greateyes flange mounted CCD cooled to -80 ºC. Click here for more details.
  • Sample Detector Distance: centered at 20 mm - 50 mm (WAXS) and ~500 mm (SAXS - currently out of commission) (use scattering standards to find the precise distance)
  • Sample Manipulators: 4 axis (x,y,z, rotation) solid sample holder (1x8 inches) from above, TEM (transmission electron microscopy) holder port compatible with FEI style holders (heating, fluids)
  • X-ray Energy range: 70 eV - 2200 eV
  • X-ray polarization: linear (0-180 degrees linear), circular (clockwise and counterclockwise)
  • sample transmission measurement via beamstop diodes
  • drain current from sample stage

Current Scientific Capabilities


  • Scattering angles from 2 - 70 degrees  with the WAXS camera - carbon edge size scales from ~5 nm - 80 nm
  • (Scattering angles from 0.05 to 4 degrees with the SAXS camera - carbon edge size scales from 40 nm - 3 µm) - currently not available
  • A number of standardized scans of common edges available, including the carbon edge at various resolutions (~10 minutes - 0.1 eV, ~5 minutes, 0.2 eV) see the Scans page for details
  • Exposure Times as low as 0.002 seconds
  • Planned features: Grazing incidence geometry with a new retractable grazing incidence beamstop


  • Multiple Measurement Modes:
    1. Transmission mode using beamstop diodes
    2. Total electron yield (TEY) mode via drain current measurements from the sample holder (for non-insulating samples)
    3. Florescence using wide angle CCD
  • Fly scanning enables fast scanning (~1/min per edge) and cyclic NEXAFS measurements (scanning upwards and downwards repeatedly in energy)
  • Polarization Specifications:
    1. fixed sample, rotating polarization mode maintains the same beam footprint on the sample, and rotates the beam polarization angle to collect a tilt-angle series
    2. fixed polarization, rotating sample to do a classic tilt angle scan
    3. normal incidence, rotating linear polarization to determine in-plane orientation
  • Planned features: Partial Electron Yield (PEY) mode measurements

Learn more about RSoXS

RSoXS Review A recent review of RSoXS, a good starting place for understanding and planning RSoXS experiments.

RSoXS Station Description A recent publication describing the SST-1 RSoXS endstation.

NIST RSoXS project Read about the larger RSoXS project at NIST which led to the building of this beamline.

NIST RSoXS station Read NIST's page about the RSoXS endstation.

User guide summary and useful links

Please see SST-1 RSoXS Beamline User Guide for a complete rundown of the process

Here is a quick list of steps you can take from your home institution to prepare and get the most out of your beamtime at the RSoXS station

  1. Apply for, schedule and arrange for beamtime
    • NSLS-II Users Guide All user information about becoming and being a user of the NSLS-II synchrotron is here
    • PASS system This is where you will submit proposals, safety approval forms, and beamtime requests
    • NSLS-II Operating Schedule Calendar showing availability of user time throughout the year.
  2. Pack and/or ship your samples. Prepare the sample spreadsheet and dry run it to generate time estimates.
    1. Download Sample Spreadsheet Template The latest version of the excel workbook.
    2. Sample sheet worksheet Guide How to fill out the bar worksheet
    3. Acquisition worksheet Guide How to fill out the acquisition worksheet
    4. Install rsoxs_scans package - install and test on the NSLS II jupyterhub (make sure you have access)
  3. Read over the Beam time workflow and Bluesky Guide to prepare for running samples - A guide to the user interaction control interface at the RSoXS station
    • NSLS-II Machine Status Live Operating Status dashboard for the synchrotron (answers: is the beam on?)
    • Remote Access (Guacamole) (Training Required) Provides access to the RSoXS endstation computers.
    • Remote access (Horizon virtual desktops)
      • Install VMware Horizon Desktop Client (web client still does not work as well) at
      • Launch the desktop app and add server:
      • Log in with BNL credentials and DUO two-factor authentication
      • The service is still in beta testing. Look through the FAQs or submit a Feedback Form if there are any questions or concerns.
    • Access your data
  4. Analyze data
    • Analysis Software written for Igor Pro
    • Analysis Software written in Python
      • PyHyperScattering - An In-development python framework for analysis of RSoXS data
      • NSLS-II Jupyterhub - Access to data and data analysis is being developed using the NSLS-II jupyterhub
      • Using PyHyperScattering in Jupyterhub - Coming soon

Commissioning Notes

Commissioning records

Commissioning procedures

Beamline Codebase

All of the bluesky code that runs at the beamline is available here: