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 hyperfinestructure 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 6p^{4 3}P₂′ by application of a Ritz formula to three levels taken as 6p³(⁴S)np⁵P₃′, 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 6p⁴¹S₀′ could not be confirmed by the data of this investigation.

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