Laser Induced Fluorescence Spectroscopy of the Rb 5S - 6S One-Photon M1 Transition

Using a collimated Rb atomic beam and locking a microwave-driven EOM sideband of our 497 nm laser to an ultrastable very high finesse optical cavity, thus tuning the laser with microwave frequency accuracy, we have conducted one-photon LIF spectroscopy of the Rb 5S - 6S transition, in both isotopes. We are in the process of measuring for the first time the M1 transition amplitude to, and the atomic scalar and vector polarizabilities α and β of, the Rb 6S state. The M1 transition amplitude has implications for detecting the Dirac Negative Energy States of Rb.