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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
PMID695132
ABSTRACT

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.

MATERIALS
Product Number
Brand
Product Description

Carbon, foil, 100x100mm, thickness 0.2mm, flexible graphite, 99.8%
Carbon, foil, 100x100mm, thickness 0.25mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 100x100mm, thickness 1.0mm, flexible graphite, 99.8%
Carbon, foil, 100x100mm, thickness 0.125mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 100x100mm, thickness 0.25mm, rigid graphite, fine grain size, 99.997%
Carbon, foil, 100x100mm, thickness 0.35mm, flexible graphite, 99.8%
Carbon, foil, 100x100mm, thickness 2.5mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 50x50mm, thickness 1.0mm, flexible graphite, 99.8%
Carbon, foil, 50mm disks, thickness 0.2mm, flexible graphite, 99.8%
Carbon, foil, 25x25mm, thickness 0.25mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 25x25mm, thickness 0.15mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 12.5x12.5mm, thickness 0.125mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 5x5mm, thickness 2.0mm, hOpg
Carbon, foil, not light tested, 100x100mm, thickness 0.075mm, flexible graphite, 99.8%
Carbon, foil, 250x250mm, thickness 0.35mm, flexible graphite, 99.8%
Carbon, foil, 50x50mm, thickness 1.0mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 50x50mm, thickness 0.5mm, rigid graphite, fine grain size, 99.997%
Carbon, foil, 25x25mm, thickness 0.1mm, pyrolytic graphite, 99.99%
Carbon, foil, 25x25mm, thickness 0.25mm, rigid graphite, fine grain size, 99.997%
Carbon, foil, 150x150mm, thickness 0.5mm, flexible graphite, 99.8%
Carbon, foil, 50x50mm, thickness 0.1mm, pyrolytic graphite, 99.99%
Carbon, foil, 50x50mm, thickness 0.125mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 250x250mm, thickness 1.0mm, flexible graphite, 99.8%
Carbon, foil, 25x25mm, thickness 0.5mm, pyrolytic graphite, 99.99%
Carbon, foil, 4mm disks, thickness 0.2mm, flexible graphite, 99.8%
Carbon, foil, 50x50mm, thickness 0.5mm, flexible graphite, 99.8%
Carbon, foil, 250x250mm, thickness 0.5mm, flexible graphite, 99.8%
Carbon, foil, 25x25mm, thickness 0.125mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 25x25mm, thickness 1.0mm, rigid graphite, fine grain size, 99.95%
Carbon, foil, 150x150mm, thickness 1.0mm, flexible graphite, 99.8%