Positron Impact Excitation of the 2S State of Atomic Hydrogen
Heliophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Received: 17 May 2019 / Revised: 6 July 2019 / Accepted: 6 July 2019 / Published: 10 July 2019
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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)
at 16.5 eV compared to 1.37(−1)
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).
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MDPI and ACS Style
Bhatia, A. Positron Impact Excitation of the 2S State of Atomic Hydrogen. Atoms 2019, 7, 69.
Bhatia A. Positron Impact Excitation of the 2S State of Atomic Hydrogen. Atoms. 2019; 7(3):69.
Bhatia, A.K. 2019. "Positron Impact Excitation of the 2S State of Atomic Hydrogen." Atoms 7, no. 3: 69.
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