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- W69452019 abstract "The breakdown of a metal surface by an ion beam as a function of the grazing angle was studied because of the importance of this problem in high- temperature plasma physics and in ion rockets. A large double-focusing massspectrometer with a sectered magnetic field was used to obtain monoenergetic ion beams. It was found that the sputtering of copper with 25 kev argon ions increases with increasing time of irradiation The pressure was 2 x 10/sup -7/ mm Hg std, and special pains were taken to eliminate contaminants. It was found that on polycrystalline material, the sputtering coefficient increases with increasing angle of incidence of the ions on the target, and is inversely proportional to the cosine of the angle of incidence. On irradiating monocrystalline samples with an ion beam, the sputtering coefficient dropped off sharply, as the direction of the ion beam approached the direction of the principal crystallographic axes of the sample. The angular distribution of the sputtered particles was determined by collecting the particles on a spherical catcher surrounding the target. The distribution of collected matter near a crystallographic axis is described by a Gaussian curve having a half-width of 20 deg . The irradiation of monocrystalsmore » by ions of different mass and energy showed that the distribution of particles near the crystallographic axes does not depend on the mass and energy of the bombarding ions. Irradiation doses of 2 to 3mA-hr-cm/sup -2/ did not result in a broadening of the angular distribution of sputtered particles of 18 to 20 . Displaced lattice atoms were found to play a significant role in radiation damage to metals. (28 references.) (TTT)« less" @default.
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- W69452019 date "1962-11-01" @default.
- W69452019 modified "2023-09-24" @default.
- W69452019 title "THE BREAKDOWN OF METALS BY ION BEAMS AS A FUNCTION OF THE ANGLE OF INCIDENCE" @default.
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