Where do photons go When they come out of the beamline and hit my crystal.

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Presentation transcript:

Where do photons go When they come out of the beamline and hit my crystal

Elastic scattering

Inelastic scattering

Photonuclear absorption

Photoelectric absorption

e-e- +

Fluorescence +

e-e- +

Photoelectric absorption

e-e- +

Secondary ionization e-e-

e-e- e-e- +

e-e- +

e-e- e-e- e-e- e-e- e-e- e-e- +

e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e

e-e- e-e- e-e- e-e- e-e- e-e e-e- e-e- + e-e-

e-e- e-e- e-e- e-e- e-e- e-e

Where do photons go? beamstop Transmitted (98%) Protein 1A x-rays

Where do photons go? beamstop elastic scattering (6%) Transmitted (98%) Protein 1A x-rays

Where do photons go? beamstop elastic scattering (6%) Transmitted (98%) inelastic scattering (7%) Protein 1A x-rays

Where do photons go? beamstop elastic scattering (6%) Transmitted (98%) inelastic scattering (7%) Protein 1A x-rays Re-emitted (99%)Absorbed (~0%)

Where do photons go? beamstop elastic scattering (6%) Transmitted (98%) inelastic scattering (7%)Photoelectric (87%) Protein 1A x-rays Re-emitted (99%)Absorbed (~0%)

Where do photons go? beamstop elastic scattering (6%) Transmitted (98%) inelastic scattering (7%)Photoelectric (87%) Protein 1A x-rays Re-emitted (~0%)Absorbed (99%) Re-emitted (99%)Absorbed (~0%)

Where do photons go? beamstop elastic scattering (6%) Transmitted (98%) useful/absorbed energy: 7.3% inelastic scattering (7%)Photoelectric (87%) Protein 1A x-rays Re-emitted (~0%)Absorbed (99%) Re-emitted (99%)Absorbed (~0%)

Where do photons go? beamstop elastic scattering (6%) Transmitted (97%) useful/absorbed energy: 7.6% inelastic scattering (5%)Photoelectric (88%) SelenoProtein 1A x-rays Re-emitted (~0%)Absorbed (99%) Re-emitted (99%)Absorbed (~0%)

Where do photons go? beamstop elastic scattering (2%) Transmitted (91%) useful/absorbed energy: 5.1% inelastic scattering (2%)Photoelectric (96%) SelenoProtein 0.92A x-rays Re-emitted (57%)Absorbed (44%) Re-emitted (99%)Absorbed (~0%) just above the edge

Where do photons go? beamstop elastic scattering (2%) Transmitted (90%) useful/absorbed energy: 5.1% inelastic scattering (2%)Photoelectric (96%) SelenoProtein 0.97A x-rays Re-emitted (60%)Absorbed (40%) Re-emitted (99%)Absorbed (~0%) far above the edge

Background scattering Resolution (Ǻ) Electron equivalents The form-factor of the cryostream measured theoretical

Background scattering Resolution (Ǻ) Photons/s/pixel Se edge with detector at 100 mm 