Our goal is to make microwave measurements of the intervals between high angular momentum Rydberg states of Ca and Yb as well as the K-splittings of the high l angular momentum states using a novel technique to detect the microwave transitions, selective excitation to the autoionizing states. The ionic dipole and quadrupole polarizabilities as well as the radial matrix elements connecting the ionic ground state to the lowest p and d states can then be extracted from our measurements with high precisions resulting in the first observational values that can be used to calculate the shift in atomic clocks.
