Resonance Ionisation Spectrometry Measurement Of Atomic Calcium Rydberg Isotope Shifts

Rydberg levels in atomic calcium are of interest due to their use in highly isotope selective multiple-step resonance ionisation spectrometry, and also for nuclear physics investigations, but gaps remain in the data for higher lying levels in calcium isotopes other than Ca-40. We report novel isotope shift data on four isotopes of calcium (Ca-42, Ca-43, Ca-44, Ca-48), relative to the majority abundance isotope Ca-40, in six Rydberg transitions for each P (n = 25-30) and F (n = 23-28) angular momentum quantum number designated series.