The lowest Bohr orbit of Positronium is one for which n=1 and l=0, so that the lowest is an S-state.
The S state has fine structure due to the spins of particles; when the two spins are oppositely directed, the atom is in a ¹S state. When the two spins are parallel, it is in a ³S state, and has higher energy.
The triplet state is a meta stable state and has longer life time than singlet state.
The life time of singlet state was revealed by J.Pirenne, J A wheeler and is of order 10⁻¹ΒΊ Sec.
The life time of Triplet state was revealed by Ore & Powell and is about 1.4x10⁻⁷ Sec.
Annihilation radiation emitted by combination of electron-Positron pair in ¹S state should consist of two gamma ray photons emitted simultaneously.
Radiation from ³S state of this system should consist of 3 πΎ ray Photons emitted simultaneously.
The first experimental evidence for formation of Positronium was obtained by M. Deutsch, who observed time delay between emission of Positron from ²²Na and appearance of annihilation photon from substance in which Positrons are observed. Several gases N₂, O₂ etc are used as absorbers of Positrons. The time delay is due to formation of Positronium.
The S state has fine structure due to the spins of particles; when the two spins are oppositely directed, the atom is in a ¹S state. When the two spins are parallel, it is in a ³S state, and has higher energy.
The triplet state is a meta stable state and has longer life time than singlet state.
The life time of singlet state was revealed by J.Pirenne, J A wheeler and is of order 10⁻¹ΒΊ Sec.
The life time of Triplet state was revealed by Ore & Powell and is about 1.4x10⁻⁷ Sec.
Annihilation radiation emitted by combination of electron-Positron pair in ¹S state should consist of two gamma ray photons emitted simultaneously.
Radiation from ³S state of this system should consist of 3 πΎ ray Photons emitted simultaneously.
The first experimental evidence for formation of Positronium was obtained by M. Deutsch, who observed time delay between emission of Positron from ²²Na and appearance of annihilation photon from substance in which Positrons are observed. Several gases N₂, O₂ etc are used as absorbers of Positrons. The time delay is due to formation of Positronium.
