Abstract
To demonstrate isotope shift measurement for high-energy highly charged ion beams, we measured precisely the 1s2s 3S1–1s2p 3P0,1,2 transition energy of He-like 12C ion accelerated up to 0.9 MeV/u and 13C ion to 0.6 MeV/u. For the precision measurement, the uncertainty coming from the ambiguity in the absolute ion beam velocity was suppressed by means of that the resonance energy was measured by two laser beams which propagate in parallel and anti-parallel directions to the ion beam. As the results, an isotope shifts of these transitions were obtained with an accuracy of 10%.
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