Data are presented on the wavelengths of 97 lines of 208Po and on the hyperfine structure of 31 lines of 209Po. From these data, relative values of 26 energy levels of 208Po I have been deduced. The hyperfine-structure splittings of 14 of these levels in 209Po have been determined. Some tentative identifications of the levels have been made, based on a determination of the absolute value of the fundamental level 6p4 3P2′ by application of a Ritz formula to three levels taken as 6p3 (4S)np 5P3′, n = 7,8,9. The ionization potential of 208Po has been tentatively estimated as 8.414 V. From the measured splittings of the energy levels of the configuration 6p4 of 209Po i, the nuclear magnetic moment of 209Po is estimated to be 0.76 nm. Mrozowski’s identifications of some lines of Po i are examined. It is found that his identifications of the 4611 Å and 5940 Å lines are confirmed by coincidence of frequencies and by hyperfine-structure patterns, but that his identifications of the other lines and his determination of 6p4 1S0′ could not be confirmed by the data of this investigation.
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