Phys. Rev. A 12, 396–405 (1975)Rotational excitation of symmetric-top molecular ions by electron impactReceived 11 November 1974; revised 2 April 1975; published in the issue dated August 1975 The theory for the rotational excitation of symmetric-top molecular ions by electron impact is formulated within the Coulomb-Born approximation. Analytical expressions are derived for the rotational transitions induced by dipole and by quadrupole interactions. The cross sections are large and finite at threshold and decrease with increasing electron-impact energy. The validity of the present theory for the description of low-energy collisions is examined. Numerical calculations are reported for the excitation of the hydronium H3O+ ion. © 1975 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.12.396
DOI:
10.1103/PhysRevA.12.396
PACS:
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