Radium spectroscopy for precision measurements and optical clocks

Spectroscopic data is of course valuable for all cold atom or molecule experiments. Its value increasing substantially for radioactive elements when small quantities are necessary or their ephemeral nature presents an additional challenge. We will discuss our spectroscopy of radium and radium ions. The precision is sufficient for trapped ion experiments with radium 224, 225, and 226. Radium 224 (nuclear spin 0) and 225 (nuclear spin 1/2) are now particularly easy to work with - we have developed a robust and long-lived atomic source, and the laser wavelengths are friendly. This work supports our ongoing experiments to enable transportable optical clocks (based on integrated-photonic friendly approaches) and realize quantum logic spectroscopy of radioactive molecules. We'll also discuss opportunities with radium and nearby radioisotopes. In the spirit of the Atomic Spectroscopy Group's database we'll mention our contributions to publicly available tools and resources.