Abstract
The peak of the Döppler broadening spectrum of KC 24 is depressed by ≈10% upon hydrogen physisorption into its interstices. The depression shows that positrons are distributed in the potassium layers. The lifetime of positrons in KC 8 is measured to be 290 ps which is longer than the lifetime in graphite. It is, therefore, deduced that the positrons are not confined in a special area, but distributed over negatively charged graphitic carbon layers and also positively charged potassium layers in KC 24 and KC 8. The narrow component of the spectrum is assigned to the annihilation of positrons with electrons in potassium layers. Imperfections included in the intercalant layers of KC 8 are detected as defects in which the positrons have a long lifetime of ≈ = 530 ps.
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