Abstract
Magnetic dipole transitions between fine- or hyperfine-structure splitting in the np23P ground term have been proposed to develop ultraprecise atomic clocks (https://link.aps.org/doi/10.1103/PhysRevLett.113.233003 Yudin etal., Phys. Rev. Lett. 113 (2014) 233003). In the present work, a spectroscopic investigation of fine-structure splitting of 4p23P1−3P0 in Rh13+ is performed in a compact electron beam ion trap. By means of a dedicated internal calibration method, the transition wavelength of 321.2150(14) nm (in air) is precisely determined at a few ppm level which agrees with the previous results and improves its uncertainty by more than 350 times.
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