Abstract
The energy distribution of Ps emitted from SiO/sub 2/ and MgO single crystals bombarded by 500--900-eV positrons was measured. For SiO/sub 2/ a nearly monoenergetic component at 3.27(4) is observed and is consistent with a bulk excitonlike Ps emitted from the surface. A broader component of approx.1.5 eV full width at half maximum is also observed. For MgO the Ps spectrum is characterized by a high-energy tail extending up to 6--7 eV. Possible models which would explain the MgO results are discussed.
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