Electron-hydrogen atom-impact 1s{yields}2s and 1s{yields}2p excitation with screened Coulomb interaction between the n=2 and n=3 excitation thresholds

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.032724· OSTI ID:21541302

Songbin, Zhang; Xiangjun, Chen ^[1]; Jianguo, Wang ^[2]; Janev, R K ^[3]

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1. Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China)
2. Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088 (China)
3. Macedonian Academy of Sciences and Arts, P. O. Box 428, 1000 Skopje (Macedonia, The Former Yugoslav Republic of)

The effects of Coulomb interaction screening on electron-hydrogen atom 1S {yields} 2S and 1S {yields} 2p excitation scattering between the n = 2 and n = 3 excitation thresholds have been investigated by using the R-matrix method with pseudostates. The excitation collision strengths show dramatic changes when the interaction screening length D varies from {infinity} to 9 a.u., as a result of the convergence of S-type and some p- and D-type Feshbach resonances to the varying 3S or 3p thresholds, and due to the crossover of some other p-, D- and all F-type Feshbach resonances into shape-type resonances when they pass across the 3S or 3p threshold at certain critical values of D. The noncrossover of some p- and D-type Feshbach resonances into shape-type resonances at the 3S (or 3p for those of D-type) threshold is at variance with the behavior of these types of resonances at the 2S (2p for those of D-type) threshold, which results from the threefold splitting of the n = 3 hydrogenic level and, consequently, the more complex nature of the configuration mixing in the n = 3 threshold region. The evolution of the total 1S {yields} 2S, 1S {yields} 2p, and 2S {yields} 2p excitation collision strengths, when the screening strength varies, is presented and discussed.

• OSTI ID: 21541302
• Journal Information: Physical Review. A, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevA.83.032724; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONFIGURATION MIXING
CONVERGENCE
D STATES
ELECTRON-ATOM COLLISIONS
ELECTRONS
EXCITATION
HYDROGEN
P STATES
R MATRIX
RESONANCE
S STATES
SCATTERING
SCREENING
ATOM COLLISIONS
COLLISIONS
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FERMIONS
INTERACTIONS
LEPTONS
MATRICES
NONMETALS