Advanced Photon Source at Argonne National Laboratory   APS USAXS instrument
USAXS instrument at the Advanced Photon Source,
X-ray science division, beamline 9ID-C

Advanced Photon Source

A U.S. Department of Energy, Office of Science,
Office of Basic Energy Sciences national synchrotron x-ray research facility

Argonne Home > Advanced Photon Source > USAXS >

Staff web pages:
      Jan Ilavsky, inst. scientist

      Glassy Carbon int. stnd.
      Example USAXS data
      Getting beam time
      Instrument Geometries
      USAXS imaging
      Sample Holders
      Select publications
      User publications
      Shipping Instructions
Live USAXS data
Software by Jan Ilavsky:
      Indra (reduction)
      Irena (analysis)
      Nika (2D data reduction)
      Cromer-Liberman AtFF
      Clementine (kinetic rate analysis)
      other macros
Useful WWW links

Glassy Carbon USAXS

Ultra-Small-Angle X-ray Scattering Facility

e-mail:, instrument scientist: Jan Ilavsky, 630-252-0866, and Ivan Kuzmenko, 630-252-0327,

Examples of USAXS data

Silica spheres in solution

Slit smeared configuration, “rocking-curve data”. These data are photodiode intensity (divided by monitor ion chamber intensity) as a function of Q vector. The data are corrected for photodiode/amplifier dark current, but no other correction is done.
The data for silica spheres in solution after all corrections – after subtracting blank from the sample measurement, calibration and desmearing.
The same data as above measured on pin hole collimated instrument (SBUSAXS). First the rocking-curve data.
The data from above, blank subtracted from the sample measurement, calibrated, this time no desmearing routine was needed.

Glassy Carbon

Glassy carbon SAXS intensity standard. glassy carbon USAXS plot

Absolute intensity conversion

For details of the conversion of raw intensity to absolute units of differential scattering cross-section per unit volume per solid angle, please consult:


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This page last modified: 2006-09-28 10:54 AM