Electron excitation cross sections for the 3s23p2 3P → 3s3p3 5S0 transition in S2+

S. J. Smith*, J. B. Greenwood, A. Chutjian, S. S. Tayal

*Corresponding author for this work

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12 Citations (Scopus)


Experimental and theoretical collisional excitation cross sections are reported for the 3s23p2 3P → 3s3p3 5S0 spin-forbidden transition in S2+. The transition energies (wavelengths) are 7.171 eV (1728.9 Å, J = 2 → 2) and 7.237 eV (1713.1 Å, J = 2 → 1). In the experimental approach, use is made of the electron energy-loss method with merged electron and ion beams. The metastable fraction in the S2+ beam is assessed and minimized. A novel "electronic aperture" is used to limit the trajectories of elastically scattered electrons into the trochoidal electrostatic analyzer. Theoretically, the R-matrix method in a 17 state and a 27 state calculation is used to obtain cross sections from threshold to 15.0 eV. Good agreement is found between experiment and the results of the 27 state theory. The presence of two strong resonances near threshold (7.5-9.0 eV) and a third resonance above threshold (11.5 eV) is verified by experiment.

Original languageEnglish
Pages (from-to)501-505
Number of pages5
JournalAstrophysical Journal
Issue number1 PART 1
Publication statusPublished - 20 Sep 2000
Externally publishedYes


  • Atomic data
  • Atomic processes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Smith, S. J., Greenwood, J. B., Chutjian, A., & Tayal, S. S. (2000). Electron excitation cross sections for the 3s23p2 3P → 3s3p3 5S0 transition in S2+. Astrophysical Journal, 541(1 PART 1), 501-505.