Abstract
Positron annihilation in a single crystal of rutile (TiO2) is investigated by analysing the energies of the emitted gamma -rays. The anisotropy in the energy distribution for emission parallel and perpendicular to the crystal c axis is measured and found to be 2.3+or-0.3% for k=0, and it vanishes at k=3.7+or-0.3 mrad, where k is the resultant positron-electron momentum. The anisotropy is attributed to covalency of the oxygen 2p shell.
Original language | English |
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Article number | 018 |
Pages (from-to) | 1257-1260 |
Number of pages | 4 |
Journal | Journal of Physics C: Solid State Physics |
Volume | 7 |
Issue number | 7 |
DOIs | |
State | Published - 1974 |
Externally published | Yes |