Positron annihilation spectroscopy
![](/Images/godic/202502/03/Levitation_of_a_magnet_on_top_of_a_superconductor_21728.jpg")
![A Feynman diagram of an electron and positron annihilating into a photon.](/Images/godic/202502/03/Electron-positron-annihilation.svg1728.png")
Positron annihilation spectroscopy (PAS) or sometimes specifically referred to as Positron annihilation lifetime spectroscopy (PALS) is a non-destructive spectroscopy technique to study voids and defects in solids.
Positron annihilation spectroscopy
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