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Open AccessArticle

Resonances in Systems Involving Positrons

Heliophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Atoms 2020, 8(2), 20;
Received: 17 February 2020 / Revised: 30 April 2020 / Accepted: 5 May 2020 / Published: 7 May 2020
(This article belongs to the Special Issue Interactions of Positrons with Matter and Radiation)
When an incident particle on a target gets attached to the target, the cross-section at that energy could be much larger compared to those at other energies. This is a short-lived state and decays by emitting an electron. Such states can also be formed by the absorption of a photon. Such states are below the higher thresholds and are called autoionization states, doubly excited states, or Feshbach resonances. There is also a possibility of such states to form above the thresholds. Then they are called shape resonances. Resonances are important in the diagnostic of solar and astrophysical plasmas. Some methods of calculating the resonance parameters are described and resonance parameters occurring in various systems are given. View Full-Text
Keywords: autoionization states; doubly excited states; Feshbach states; resonances; shape resonances autoionization states; doubly excited states; Feshbach states; resonances; shape resonances
MDPI and ACS Style

Bhatia, A.K. Resonances in Systems Involving Positrons. Atoms 2020, 8, 20.

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