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We report on improved isotope shift measurements of the isotopes$^{40,42,44,48}$Ca in the $4s\,^2 \rm{S}_{\frac{1}{2}} \rightarrow4p\,^2\rm{P}_{\frac{3}{2}}$ (D2) transition using collinear laser spectroscopy.Accurately known isotope shifts in the $4s\,^2 \rm{S}_{\frac{1}{2}} \rightarrow4p\,^2\rm{P}_{\frac{1}{2}}$ (D1) transition were used to calibrate the ion beamenergy with an uncertainty of $\Delta U \approx \pm 0.25$ V. The accuracy inthe D2 transition was improved by a factor of $5 - 10$. A King-plot analysis ofthe two transitions revealed that the field shift factor in the D2 line isabout 1.8(13) % larger than in the D1 transition which is ascribed torelativistic contributions of the $4p_{1/2}$ wave function.

Isotope shift of $^{40,42,44,48}$Ca in the $4s\,^2 \rm{S}_{\frac{1}{2}} \rightarrow 4p\,^2\rm{P}_{\frac{3}{2}}$ transition