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Determination of Hyperfine-Induced Transition Rates from Observations of a Planetary Nebula

Judge, Philip G.; Proffitt, Charles R.; Brage, Tomas

Observations of the planetary nebula NGC3918 made with the STIS instrument on the Hubble Space Telescope reveal the first unambiguous detection of a hyperfine-induced transition 2s2p

3

P^o₀→2s²

1

S₀ in the berylliumlike emission line spectrum of N IV at 1487.89Å. …