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Balmer emission induced by proton impact on atomic hydrogen

Journal Article · · Journal of Physics. B, Atomic, Molecular and Optical Physics
 [1];  [2];  [2];  [2];  [3];  [4]
  1. Curtin Univ., Perth, WA (Australia). Curtin Inst. for Computation. Dept. of Physics and Astronomy; DOE/OSTI
  2. Curtin Univ., Perth, WA (Australia). Curtin Inst. for Computation. Dept. of Physics and Astronomy
  3. Tashkent State Pedagogical Univ., Tashkent (Uzbekistan)
  4. Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
+ Show Author Affiliations
The semiclassical two-centre convergent-close-coupling approach is applied to study Balmer emission in proton-hydrogen scattering at the incident proton energies from 5–1 MeV. The approach uses wave-packet pseudostates for the discretization of the continuous spectrum of the hydrogen atom, constructed from the Coulomb wave function. All cross sections for target excitation into the final states with principal quantum numbers n = 3 and 4 required for obtaining the Balmer emission cross sections, polarisation fraction and Balmer decrement are calculated. Corresponding electron-capture cross sections are also given. A substantial variation in the cross sections for population of magnetic sublevels obtained in different theoretical approaches is found. The present cross section for excitation of the n = 3 shell as a whole does not agree with experiment, but supports earlier calculations. At the same time, the individual cross section for excitation of the 3p state displays excellent agreement with available experimental measurements. The results for polarisation fraction of the Balmer-α emission significantly disagree with experimental measurements at high energies. The calculated Balmer decrement plateaus at about 100 keV and can be used in astrophysical applications.
Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
FG02-93ER40773; NA0003841
OSTI ID:
1610246
Alternate ID(s):
OSTI ID: 22988691
Journal Information:
Journal of Physics. B, Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics. B, Atomic, Molecular and Optical Physics Journal Issue: 10 Vol. 52; ISSN 0953-4075
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Atomic data for calculation of the intensities of Stark components of excited hydrogen atoms in fusion plasmas text January 2020
Electron capture, excitation and ionization in He 2+ –H and H + –He + collisions journal July 2019

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74 ATOMIC AND MOLECULAR PHYSICS