Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..709l&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Sept. 1, 1980, p. 709-717.
Astronomy and Astrophysics
Astrophysics
7
Atomic Excitations, Ground State, Oxygen Ions, Particle Collisions, Proton Scattering, Sulfur, Atomic Energy Levels, Electron Transitions, Fine Structure, Isoelectronic Sequence, Quantum Mechanics, Schroedinger Equation, Transition Probabilities
Scientific paper
Proton collisional excitation cross sections and rate constants are presented for transitions between the fine-structure levels of the p4 3P ground terms for ions belonging to the oxygen (F II-S IX) and sulfur (Cl II-Ni XIII) isoelectronic sequences. A symmetrized semiclassical impact parameter method was used involving direct integration of the Schrödinger equation for electric quadrupole excitation. The effects on the 3PJ → 3PJ' cross sections of truncating the interaction matrix from the five-level ground configuration basis to the three-level ground term basis is determined for Ni XIII, where the situation is most extreme; the cross sections in this case increase by at most 10-1 5%o depending on the transition.
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