Measurement of Absolute Cross Sections for Excitation of the 2s2 1S --> 2s2p 1Po Transition in O+4

Details Measurement of Absolute Cross Sections for Excitation of the 2s2 1S --> 2s2p 1Po Transition in O+4 Measurement of Absolute Cross Sections for Excitation of the 2s2 1S --> 2s2p 1Po Transition in O+4

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...630.1213s&link_type=abstract

The Astrophysical Journal, Volume 630, Issue 2, pp. 1213-1216.

Astronomy and Astrophysics

Astronomy

4

Atomic Data, Atomic Processes, Stars: Abundances, Sun: Abundances

Scientific paper

Experimental cross sections are reported for the 1s22s21S-->1s22s2p1Po transition in O+4 located at 19.689 eV. Use is made of the electron energy-loss method, using a merged electron-ion beam geometry. The center-of-mass interaction energies for the measurements in the 1S-->1Po transition are in the range 18 eV (below the threshold) to 30 eV. Data are compared with other previous electron energy-loss measurements and with results of a 26 term R-matrix calculation that includes fine structure explicitly via the Breit-Pauli Hamiltonian. Clear resonance enhancement is observed in all experimental and theoretical results near the threshold for this 1S-->1Po transition.

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