Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..640c&link_type=abstract
Astrophysical Journal, vol. 206, June 1, 1976, pt. 1, p. 640-651.
Astronomy and Astrophysics
Astrophysics
21
Electron Impact, Electron Transitions, Hydroxyl Emission, Hyperfine Structure, Molecular Excitation, Scattering Cross Sections, Born Approximation, Electron Scattering, Graphs (Charts), Quadrupoles, Transition Probabilities
Scientific paper
The theory of excitation of the internal structures of OH by electron or heavy-particle impact is formulated within the quantum-mechanical close-coupling approximation, incorporating spin-orbit and hyperfine interactions. In the case of electron impact, explicit Born formulae are derived and the selection rules are discussed for the dipole- and the quadrupole-induced transitions. Numerical results are reported for the electron excitation cross sections of the hyperfine-structure transitions among the lower-lying rotational ladders of two states.
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