Radiative lifetimes in Ni II

Astronomy and Astrophysics – Astronomy

Scientific paper

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Laser Induced Fluorescence, Nitrogen, Radiative Lifetime, Ultraviolet Astronomy, Atomic Energy Levels, Far Ultraviolet Radiation, Hubble Space Telescope, Transition Probabilities

Scientific paper

The use of time-resolved laser-induced fluorescence to measure the radiative lifetimes for 12 levels in Ni II is examined. The equipment and procedures for measuring the lifetimes are described, and a table of the lifetimes observed is presented. The radiative lifetimes were combined with branching ratios in order to obtain accurate transition probability measurements. The possibility of extending time-resolved laser-induced fluorescence into the VUV is discussed. It is concluded that time-resolved laser-induced fluorescence techniques can provide the data needed to analyze the astronomical observations in the VUV region obtained from the HST.

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