Abstract

Doppler-tuned laser spectroscopy has been applied to a foil-stripped 1 MeV/u silicon ion beam to measure the 1s2s 1 S 0-1S2P 3 P 1 intercombination interval in 28Si12+. To obtain sufficient transition probability the Si12+ beam was merged co-linearly with over 2 kW of continuous-wave laser light at 1319 nm inside an ultra-high finesse build-up cavity. The measurement differentiates between current theories for the n = 2 levels of helium-like ions.

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