Isotope shift measurement between He-like C-12 and C-13 ions in 1s2s S-3(1)-1s2p P-3(0,1,2) transitions

To demonstrate isotope shift measurement for high-energy highly charged ion beams, we measured precisely the 1s2s(3)S(1)-1s2p(3)P(0,1,2) transition en ergy of He-like C-12 ion accelerated up to 0.9 MeV/u and C-13 ion to 0.6 Me V/u. For the precision measurement, the uncertainty coming from the ambigui ty in the absolute ion beam velocity was suppressed by means of that the re sonance energy was measured by two laser beams which propagate in parallel and anti-parallel directions to the ion beam. As the results, an isotope sh ifts of these transitions were obtained with an accuracy of 10%.