R-matrix calculations of electron impact excitation rates in 0 III are used to derive the electron-density-sensitive emission-line ratioR = 1 (2s2 2p23P2-2s22P23P1)/I (2s22p23P1 - 2s22p23P0) =I (52μm)/I (88μm) for a range of electron temperatures(Te = 5000-20000 K) and densities(Ne=10–105 cm−3) applicable to planetary nebulae. Electron densities deduced from the observed values ofR in several planetary nebulae are in excellent agreement with those deduced from C1 I and Ar IV, which provides support for the accuracy of the atomic data adopted in the calculations.
Volume 40 | Issue 3
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