Isotope shifts of the 4s2 1S0 -> 4s5p 1P1 transition and hyperfine   splitting of the 4s5p 1P1 state in calcium
  Using a technique based on production of ion Coulomb crystals, the isotope shifts of the 4s2 1S0 -> 4s5p 1P1 transition for all naturally occurring isotopes of calcium as well as the hyperfine splitting of the 4s5p 1P1 state in Ca-43 have been measured. The field shift and specific mass shift coefficients as well as the hyperfine structure constants for Ca-43 have been derived from the data. 
A. Mortensen, J. J. T. Lindballe, I. S. Jensen, P. Staanum, D. Voigt,   and M. Drewsen