Collisional excitation rates for transitions between the fine structure levels of the ground term of Ne(2+)

Details Collisional excitation rates for transitions between the fine structure levels of the ground term of Ne(2+) Collisional excitation rates for transitions between the fine structure levels of the ground term of Ne(2+)

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208p..17b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 1, 1984, p. 17P-23P. Research supported by th

Astronomy and Astrophysics

Astronomy

31

Atomic Energy Levels, Collision Rates, Electron Scattering, Fine Structure, Neon, Cosmic Plasma, Electron Density (Concentration), Electron Transitions, Positive Ions

Scientific paper

A four-state close-coupling approximation is used to obtain electron impact excitation rates for transitions among the levels of the lowest configuration of Ne2+. The results from statistical equilibrium calculations including the new rates show that the intensity ratio I(15.6 μm)/I(36.0 μm) is density sensitive for electron densities in the range of 104 to 106 cm-3 with negligible temperature variation. It is also shown that the ratio I(15.6 μm)/I(3869 Å) is highly sensitive to temperature for densities less than about 105cm-3 with only slight dependence on density. The intensity of the 15.6 μm line is itself a slowly varying function of the physical conditions up to an electron density of about 104cm-3 giving the possibility of an accurate determination of the Ne2+ abundance.

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