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Radiation damage due to knock-on processes on carbon foils cooled to liquid helium temperature.

Radiation damage due to knock-on processes on carbon foils cooled to liquid helium temperature.

Ultramicroscopy (1978-01-01)

I Dietrich, F Fox, H G Heide, E Knapek, R Weyl

摘要

Radiation damage on a holey carbon foil was investigated in an electron microscope with a superconducting lens system, where the temperature of the specimen and its environment initially was 4 K. Due to an electron dose of 2 X 10(4) As/cm2 the diameter of a hole increased 5 nm. Rough calculations show that this increase can be ascribed to knock-on processes. Estimates of the rise in specimen temperature during the irradiation are given.

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碳, foil, 5x5mm, thickness 2.0mm, hOpg

碳, foil, 100x100mm, thickness 0.5mm, flexible graphite, 99.8%

碳, foil, 10x10mm, thickness 2.0mm, hOpg

碳, foil, 25x25mm, thickness 0.5mm, pyrolytic graphite, 99.99%

碳, foil, 50x50mm, thickness 0.2mm, flexible graphite, 99.8%

碳, foil, not light tested, 100x100mm, thickness 0.075mm, flexible graphite, 99.8%

碳, foil, 25x25mm, thickness 0.1mm, pyrolytic graphite, 99.99%

碳, foil, 15x15mm, thickness 2.0mm, hOpg

碳, foil, 100x100mm, thickness 0.125mm, rigid graphite, fine grain size, 99.95%

碳, foil, 50x50mm, thickness 0.1mm, pyrolytic graphite, 99.99%

碳, foil, 50x50mm, thickness 1.0mm, flexible graphite, 99.8%

碳, foil, 100x100mm, thickness 0.2mm, flexible graphite, 99.8%

碳, foil, 12mm disks, thickness 0.5mm, rigid graphite, fine grain size, 99.95%

碳, foil, 50x50mm, thickness 0.2mm, pyrolytic graphite, 99.99%

碳, foil, 150x150mm, thickness 1.0mm, rigid graphite, fine grain size, 99.95%

碳, foil, 5x10mm, thickness 2.0mm, hOpg

碳, foil, not light tested, 150x150mm, thickness 0.075mm, flexible graphite, 99.8%

碳, foil, 25x25mm, thickness 0.25mm, rigid graphite, fine grain size, 99.95%

碳, foil, 25x25mm, thickness 0.2mm, flexible graphite, 99.8%

碳, foil, not light tested, 300x300mm, thickness 0.075mm, flexible graphite, 99.8%

碳, foil, 150x150mm, thickness 1.0mm, flexible graphite, 99.8%

碳, foil, 25x25mm, thickness 0.25mm, rigid graphite, fine grain size, 99.997%

碳, foil, 25x25mm, thickness 0.5mm, rigid graphite, fine grain size, 99.95%

碳, foil, 300x300mm, thickness 0.2mm, flexible graphite, 99.8%

碳, foil, 50x50mm, thickness 0.35mm, flexible graphite, 99.8%

碳, foil, 50x50mm, thickness 0.5mm, flexible graphite, 99.8%

碳, foil, 50x50mm, thickness 5.0mm, rigid graphite, medium grain size, 99.5%

碳, foil, 50mm disks, thickness 0.2mm, flexible graphite, 99.8%

碳, foil, 150x150mm, thickness 0.35mm, flexible graphite, 99.8%

碳, foil, 100x100mm, thickness 1.0mm, flexible graphite, 99.8%