The spectrum of Mo VIII has been observed in a sliding-spark discharge with a 5-m grazing-incidence spectrograph. The analysis has yielded nearly all levels of the 4p⁴4d configuration that can combine with the 4p⁵²p ground term. Six of the eight levels of the 4p⁴5s configuration given previously by Charles and by Chaghtai were confirmed. New values were found for the remaining two. The 4s²4p⁴4d+4s²4p⁴5s+4s4p⁶ level structure has been theoretically interpreted, with configuration-interaction effects included. The 4s4 p⁶²S_½ level was found to have a 21% 4s²4p⁴ (¹D)4d²S character and the 4s²4 p⁴(¹D)4d²S_½ level a 19% 4s4 p⁶²S character. The energy parameters determined by a least-squares fit to the observed level values are compared with Hartree—Fock (HF) calculations. The ionization energy is estimated to be 144.0±1.0 eV. Isoelectronic comparisons for the level positions in Y v, Zr VI, Nb VII, and Mo v are given graphically. The ratios of the fitted energy parameters to the HF values are compared for these ions.

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