Ion charge states of 3d metal ions in the electron beam of the Dresden electron beam ion trap (EBIT), a room-temperature EBIT, are determined by x-ray spectroscopy. It is shown that ions of highest charge states as bare nuclei and hydrogen- and helium-like ions can be produced with ion densities of about 105cm−3 up to 108cm−3 in the trap. The Dresden EBIT operates at a typical working gas pressure region of 10−8mbar down to 10−10mbar. Thus the influence of the realized working gas pressure on the derived ion charge state distribution is investigated by model calculations.

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