Abstract
The sum of the first three ionisation potentials of the lanthanons are calculated by applying the Born-Haber cycle to the group 3A oxides and arsenides. The third ionisation potentials are estimated by subtracting the published values of the first and second ionisation potentials. The values obtained, in eV, are:− Ce, 20·0; Pr, 21·6; Nd, 22·2; Sm, 23·7; Eu, 24·9; Gd, 20·6; Tb, 21·9; Dy, 22·9; Ho, 23·1; Er, 22·6; Tm, 23·8; Yb, 25·3; Lu, 21·2;. In all cases the uncertainty is estimated to be ± 0·5 eV except for Gd and Lu, where the estimated uncertainty is ± 0·8 eV.
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