Proton collisional excitation of fine structure transitions in the ground configuration of Ca/14+/, Fe/20+/, and Ni/14+/

Details Proton collisional excitation of fine structure transitions in the ground configuration of Ca/14+/, Fe/20+/, and Ni/14+/ Proton collisional excitation of fine structure transitions in the ground configuration of Ca/14+/, Fe/20+/, and Ni/14+/

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..589f&link_type=abstract

Astronomy and Astrophysics, vol. 54, no. 2, Jan. 1977, p. 589-592.

Astronomy and Astrophysics

Astrophysics

25

Atomic Excitations, Electron Transitions, Fine Structure, Ionic Collisions, Proton Impact, Solar Corona, Abundance, Calcium, Cations, Coulomb Collisions, Coulomb Potential, Ground State, Iron, Metal Ions, Nickel, Temperature Effects

Scientific paper

A close-coupling quantum method is applied to compute cross sections and rates for proton collisional excitation of 3P fine-structure transitions in the ground configurations of Ca(14+), Fe(20+), and Ni(14+). The electrostatic interaction potential is approximated by its long-range quadrupole part. Cross sections are calculated over a wide energy range to obtain excitation rates for coronal temperatures of interest, and excitation rates are obtained over temperature ranges centered on the temperature of maximum abundance for each ion. A comparison of the present results with available semiempirical results indicates that those semiempirical excitation rates based on extrapolation at low and high energies are overestimated for ground-configuration ions and that the high-temperature behavior derived for the excitation rates on the basis of the same extrapolation is incorrect.

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