Abstract

The ionization energies of the neutral rare earths have been derived by means of interpolated values for the energy differences between the 4fN6s2, 4fN6s7s, and 4fN6s8s configurations and the difference in the effective quantum numbers of the 4fN6s7s and 4fN6s8s configurations. In Ce i the 4f5d2ns series was used. The results in eV are:

Ce i5.65
Pr i5.42
Nd i5.49
Pm i5.55
Sm i5.63
Eu i5.68
Dy i5.93
Ho i6.02
Er i6.10
Tm i6.18
Yb i6.25.
The uncertainty is estimated to be ±0.02 eV in all cases but Ce i for which the estimated uncertainty is ±0.06 eV. Values for La i and Gd i obtained spectroscopically by other workers are also tabulated. The present results are compared with those obtained by means of surface ionization. The calculated result for Tb i was inconclusive because of the lack of sufficient knowledge of the energy-level structure.

© 1966 Optical Society of America

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