Abstract

We have been using the Tokyo electron beam ion trap to investigate the relativistic and the quantum electrodynamical effects on the atomic structure of few electron heavy ions. In this paper, we present 1s binding energy measurement for hydrogen-like rhodium which was performed as one of such systematic studies. It has been obtained by measuring the X-ray transition energy for radiative recombination into the 1s vacancy of bare rhodium and subtracting the electron beam energy from it. For further investigation, a bent crystal spectrometer for hard X-rays is being developed. The design of the new spectrometer and the preliminary result with it are also presented.

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