Next Article in Journal
Shannon, Rényi, Tsallis Entropies and Onicescu Information Energy for Low-Lying Singly Excited States of Helium
Previous Article in Journal
Erratum: Oks, E. Review of Recent Advances in the Analytical Theory of Stark Broadening of Hydrogenic Spectral Lines in Plasmas: Applications to Laboratory Discharges and Astrophysical Objects. Atoms 2018, 6, 50
Open AccessArticle

Positron Impact Excitation of the 2S State of Atomic Hydrogen

Heliophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Atoms 2019, 7(3), 69;
Received: 17 May 2019 / Revised: 6 July 2019 / Accepted: 6 July 2019 / Published: 10 July 2019
The excitation cross-sections of the 2S state of atomic hydrogen at low (near threshold energy) to high incident positron energies (10.30 to 300 eV) have been calculated using the variational polarized-orbital method. Nine partial waves have been used to obtain converged cross-sections in the above energy range. The cross sections compared to the electron-impact excitation of the S state of atomic hydrogen are larger in the present case. The maximum cross section is 3.63(−1) π a 0 2 at 16.5 eV compared to 1.37(−1) π a 0 2 at 11.14 eV for the electron-impact excitation. The present results are compared with other calculations. Cross-sections have also been calculated in the Born approximation in which the polarization of the target has been included. Differential cross sections were calculated at k = 1.0 (13.6eV), 2.5 (85 eV), 3.483 (200 3V), and 4.696 (300 eV). View Full-Text
Keywords: positron-impact excitation positron-impact excitation
Show Figures

Figure 1

MDPI and ACS Style

Bhatia, A. Positron Impact Excitation of the 2S State of Atomic Hydrogen. Atoms 2019, 7, 69.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop