Abstract
The hyperfine structure in the spectrum of doubly ionized Pr141 was observed by means of a sliding spark discharge and a concave-grating spectrograph. Measurements of the hyperfine patterns resulted in a value for the splitting factor of the 6s electron of a6s=+0.639±0.007 cm1. The probability density of the 6s electron at the nucleus was calculated by using interpolated values of the energy difference and quantum defect difference for the 4f26s and 4f27s configurations. Application of the Goudsmit-Fermi-Segrè formula yields a value for the nuclear magnetic moment μI=+4.09±0.06 nm. The various contributions to the stated uncertainties are discussed in detail.

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