Optical Pumping at High Temperatures

Optical pumping signals with Rb have been detected at temperatures ranging from 50 to 850^∘{}C. Spin-exchange signals have been detected with Ag (at 750^∘{}C), Li (at 400^∘{}C), and with electrons, hydrogen, and nitrogen over the entire temperature range. A preliminary value for the Li⁶ hfs separation is given.