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In order to determine the optimum set up for each experiment, a couple of important pieces of information are needed. If you do not understand or know the answers to any of these questions, please contact a member of the beamline team who will be happy to advise you.

  • What is the q range of interest for your experiment?
  • Which energy will you need to use for your experiment?
  • Does your sample has a preferred orientation or alignment? Do you want to maximise the q-range by setting the beamstop at the top, or investigate orientation effects using a central beamstop?
  • Do you need to measure WAXS?

Using this information, the table below can help you to work out the set up requirements for each experiment. Please note that there is a time cost associated with all set up changes during an experiment and so we do not recommend more than one camera length, energy or sample environment change during an experiment. Please discuss all set up requirements in advance with your local contact.

Energy and wavelength

The beamline team will often refer to the energy of the beamline, which relates to the wavelength of the light used. I22 is monochromatic, so a single wavelength is used. Energy and wavelength are related by this simple equation:

Most laboratory sources and other scattering tools will refer to the wavelength rather than the energy, so it's good to know how to switch between the two. Some popular choices of energy are:

12.4 keV1 Å
8 keV1.54 Å (Cu K alpha)
17.5 keV0.71 Å (Mo K alpha)

Camera length and energy table

SAXS using Pilatus P3-2M (2D detector) 

Isotropic SAXS (Beamstop at top)

Sample-Detector Distance / mEnergy / keVqminqmaxdmindmax

1.9

54.90E-030.35017.91300
 76.80E-030.49012.8930
 109.67E-030.7008.96650
 12.41.20E-020.8707.23525
 141.40E-020.9806.40465
 171.60E-021.195.27380
 201.90E-021.404.48325
3.952.39E-030.17436.12630
 73.34E-030.24425.81880
 104.78E-030.34818.11320
 12.45.92E-030.43214.61060
 146.69E-030.48712.9940
 178.12E-030.59210.6775
 209.55E-030.6969.03660
5.951.59E-030.11654.33960
 72.22E-030.16238.82830
 103.17E-030.23127.21980
 12.43.93E-030.28721.91600
 144.44E-030.32419.41420
 175.39E-030.39315.91170
 206.34E-030.46313.6990
7.951.19E-030.08772.65300
 71.66E-030.12151.83780
 102.37E-030.17336.32650
 12.42.94E-030.21529.22140
 143.32E-030.24225.91890
 174.03E-030.29421.31560
 204.75E-030.34618.11320
9.759.72E-040.07188.56460
 71.36E-030.09963.24620
 101.95E-030.14244.33230
 12.42.41E-030.17635.72600
 142.72E-030.19931.62300
 173.31E-030.24126.01900
 203.89E-030.28422.11620

 Anisotropic SAXS (Beamstop at centre)

Sample-Detector Distance / mEnergy / keVqminqmaxdmindmax
1.954.90E-030.18733.61300
 76.80E-030.26224930
 109.67E-030.37516.8650
 12.41.20E-020.46413.5525
 141.40E-020.52412.00465
 171.60E-020.6379.87380
 201.90E-020.758.39325
3.952.39E-030.09367.92630
 73.34E-030.1348.51880
 104.78E-030.18533.91320
 12.45.92E-030.2327.41060
 146.69E-030.25924.2940
 178.12E-030.31520.0775
 209.55E-030.3717660
5.951.59E-030.061102.03960
 72.22E-030.086732830
 103.17E-030.12351.11980
 12.43.93E-030.15241.21600
 144.44E-030.17236.51420
 175.39E-030.20930.11170
 206.34E-030.24625.5990
7.951.19E-030.046136.55300
 71.66E-030.06497.53780
 102.37E-030.09268.22650
 12.42.94E-030.11455.12140
 143.32E-030.12948.81890
 174.03E-030.15640.21560
 204.75E-030.18434.11320
9.759.72E-040.038167.06460
 71.36E-030.0531194620
 101.95E-030.07583.33230
 12.42.41E-030.09467.22600
 142.72E-030.10659.52300
 173.31E-030.12849.01900
 203.89E-030.15141.61620

 

WAXS using Pilatus3-2M-DLS-L

The exact q-ranges available from the WAXS detector are variable due to the large number of possible sample/WAXS Detector/SAXS detector configurations but, as a guide, numbers below are given for sample - WAXS detector distance = 175.4mm and with the pirmary beam passing 2mm from the edge of the WAXS detector chips.

Energy (keV)qminqmax (Horizontal)qmax (Vertical)

5

0.0291.911.98
70.0402.672.77
100.0583.823.95
12.40.0724.734.90
140.0815.345.54
170.0986.496.72
200.1167.637.91

NOTE: For a given detector geometry and energy, if qmin(WAXS) < qmax(SAXS) you will have overlap between data sets.

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