Slow (5 eV) positrons (e⁺) are observed emanating from clean (submonolayer contaminated) single-crystal metal surfaces which are being bombarded by 0.1-3-keV e⁺. A portion of the emitted slow e⁺ from Al(100) has a narrow range of energies and a temperature-dependent intensity which suggests that these e⁺ are thermalized in the bulk and have a negative work function φ₊=-0.2±0.1 eV. A higher-energy portion of the slow-e⁺ spectrum has a temperature-independent intensity attributable to nonthermalized e⁺.
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Mills et al. (1978) studied this question.
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