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- W2038045133 abstract "A direct ion beam deposition system designed for heteroepitaxy at a low substrate temperature and for the growth of metastable compounds has been constructed and tested. The system consists of two mass-resolved low-energy ion beams which merge at the target with an incident energy range 50–25 000 eV. Each ion beam uses a Freeman ion source for ion production and a magnetic sector for mass filtering. While a magnetic quadrupole lens is used in one beam for ion optics, an electrostatic quadrupole lens focuses the other beam. Both focusing approaches provide a current density more than 100 μA/cm2, although the magnetic quadrupole gives a better performance for ion energies below 200 eV. The typical current of each beam reaches more than 0.3 mA at 100 eV, with a ribbon beam of about 0.3–0.5×2 cm2. The target is housed in an ultrahigh vacuum chamber with a base pressure of 1×10−7 Pa and a typical pressure of 5×10−6 Pa when a noncondensable beam like argon is brought into the chamber. During deposition, the target can be heated to 800 °C and scanned mechanically with an electronic scanning control unit. The dual beam system has been used to grow GaN using a Ga+ and a N+ beam, and to study the oxygen and hydrogen ion beam bombardment effects during carbon ion beam deposition. The results showed that the simultaneous arrival of two beams at the target is particularly useful in compound formation and in elucidation of growth mechanisms." @default.
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- W2038045133 date "1991-10-01" @default.
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- W2038045133 title "Construction and applications of a dual mass-selected low-energy ion beam system" @default.
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- W2038045133 doi "https://doi.org/10.1063/1.1142293" @default.
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