Bi Jin

Yamaguchi University, Yamaguti, Yamaguchi, Japan

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Publications (2)3.61 Total impact

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    ABSTRACT: Ionization cross section, Qion, measurements by positron impact on He and Ar atoms have been performed using a time-of-flight method, and analyzed with interest in their threshold behavior. The experimental data of this work and our previous ionization cross section data are compared with those of Knudsen et al. and other data. The exponent (n) of the excess energy, E−Eion, is 1.0–1.3, which differs from the theoretical value n = 2.651. The threshold behavior of excitation cross sections, Qex, by positron impact on the same atoms, is also discussed.
    Applied Surface Science 01/1995; 85:59-63. · 2.54 Impact Factor
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    ABSTRACT: The production of low-energy positron beams for positron-gas scattering experiments has been tested using thin W(100) foils in high-vacuum pressure (10(exp -6) Torr). The W foil was baked for cleaning and used as a positron moderator in situ. The efficiency of positrons reemitted from the thin foil was 14 +/- 2% for a 1000-angstrom-thick foil and 10 +/- 2% for a 2000-angstrom-thick one. The positron work function of the W(100) surface in 10(exp -6) Torr was - 1.9 +/- 0.3 eV. The energy width in situ was 1.5 +/- 0.2 eV, narrower than that exposed to air. The feasibility of the brightness-enhancement method in 10(exp -6) Torr for positron-gas scattering experiments was discussed.
    Japanese Journal of Applied Physics 01/1994; 33. · 1.07 Impact Factor