title: Visible Forbidden Transitions of Highly Charged Ions authors: D. Kato*, T. Fukami#,T. Kinugawa*, S. Ohtani*,#, H. Watanabe* and C. Yamada# affiliations: * Cold Trapped Ions Project, Japan Science & Technology Co. , Tokyo, Japan # University of Electro-Communications, Tokyo, Japan summary: Visible forbidden transitions of highly charged I, Xe, Cs and Ba ions were observed with Tokyo Electron-Beam Ion Trap (Tokyo-EBIT). Wavelengths and oscillator strengths of the magnetic-dipole transition between ground-state fine-structure levels were calculated for titaniumlike ions of various elements. The wavelengths were compared with the measurements with the Tokyo-EBIT; the present calculations reduced discrepancy in the wavelengths down to below 1%.