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 |
|---|---|
| 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 |