Abstract
The surface ionization comparison technique was used to measure the first ionization potentials of Th, Np, and Pu relative to U. The differences in ionization potentials (ΔI.P.) obtained were: ΔI.P.(U–Th) = −1.29 ± 0.26 eV; ΔI.P.(U–Np) = 0.03 ± 0.01; and ΔI.P.(U–Pu) = 0.48 ± 0.02. The I.P. of U had previously been determined in this laboratory to be 6.19 ± 0.06 eV. Based on this value, the I.P. of Th is 7.5 ± 0.3 eV; Np, 6.16 ± 0.06; and Pu, 5.71 ± 0.06.
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