Saturation and isotopic shift of the Kr 84 excited-state transition at 1547.825 nm

Linewidth broadening and saturation intensity measurements of the Kr 84 1s2-2p8 transition have been carried out with opto-galvanic spectroscopy. The Doppler-free natural linewidth of Kr 84 and Kr 83 has been determined to be 56 MHz. Transitions were observed in many other isotopes of Kr, with shifts of several GHz from the line of Kr 84.