The subject of this book is the investigation of lattice imperfections in semiconductors by
means of positron annihilation. A comprehensive review is given of the different positron …

Positronium (Ps) is an exotic hydrogenic atom composed of an electron bound to a positron
via the Coulomb force. Being composed of two low-mass leptons, positronium is, for all …

Quantum electrodynamics (QED) is the first successful and still the most successful quantum
field theory. Simple atoms, being essentially QED systems, allow highly accurate theoretical …

Positron Annihilation in Chemistry gives a critical review of the chemistry-oriented positron
annihilation research. The only three light particles participating in low energy physics and …

This book provides a comprehensive and up-to-date account of the field of low energy
positrons and positronium within atomic and molecular physics. It begins with an …

We report a new measurement of the positronium (Ps) 2 S 3 1→ 2 P 3 0 interval. Slow Ps
atoms, optically excited to the radiatively metastable 2 S 3 1 level, flew through a microwave …

Positronium is the quasistable bound system consisting of an electron and its antiparticle,
the positron. Its energy levels can be explained to a high degree of accuracy by the …

The long-standing discrepancy [GS Adkins, RN Fell, and J. Sapirstein, Ann. Phys.(NY) 295,
136 (2002) APNYA6 0003-4916] between the theoretical calculations of the …

As an unstable light pure leptonic system, positronium is a very specific probe atom to test
bound state QED. In contrast to ordinary QED for free leptons, the bound state QED theory is …

The singlet decay rate has been measured using magnetic singlet-triplet state mixing for
positronium formed in a N 2-isobutane gas mixture. We find λ s= 7990.9±1.7 μ s− 1. At 215 …