Resolving the electron temperature discrepancies in H II regions and planetary nebulae: kappa-distributed electrons by David C. Nicholls and others 2026-10-20
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By David C. Nicholls, Michael A. Dopita and Ralph S. Sutherland. arXiv:1204.3880v2 (2012). Section 4, equation 18 and the following paragraph give a low-density Maxwellian oxygen-line approximation and its collision-strength qualification.
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