Effect of atomic electric quadrupole moment on positron binding

Autor: Harabati, C., Dzuba, V. A., Flambaum, V. V.
Rok vydání: 2014
Předmět:
Zdroj: Physical Review A Volume: 90 Issue: 1 Article Number: 014501 (JUL 21 2014)
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevA.90.014501
Popis: Effect of the electric quadrupole moment, $Q$, is studied for positron-atom bound systems. It is demonstrated that for $Q >50$ a.u. the electric quadrupole potential is sufficiently strong to bind positron (or electron) even in the absence of the dipole polarization potential. Such large values of $Q$ are not known for atomic ground states, however, they exist in molecules and excited atoms. In the state $2s2p~^3P^o_2$ of beryllium, the quadrupole contribution makes difference between stable bound state and decay to Be$^+$ ion and positronium. In a majority of atoms the quadrupole contribution is small and can be neglected.
Comment: 5 pages, 1 figure
Databáze: arXiv