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 i
5.65
Pr i
5.42
Nd i
5.49
Pm i
5.55
Sm i
5.63
Eu i
5.68
Dy i
5.93
Ho i
6.02
Er i
6.10
Tm i
6.18
Yb i
6.25.
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.
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Values of the electrostatic parameters used for determination of the positions of the unperturbed centers of gravity.
Configuration
Parameter
Value (cm−1)
4fN6s7s
G3(4f6s)
200± 10
4fN6s7s
G3(4f7s)
35± 5
4fN6s8s
G3(4f8s)
20± 5
4fN6s7s
G0(6s7s)
830±200
4fN6s8s
G0(6s8s)
190± 50
4f5d26s
G2(5d6s)
1200±200
4f5d26s
G3(4f6s)
150± 50
Table II
Ionization energies of the neutral rare earths obtained by series calculations, and quantities involved in their determination. Values for La i and Gd i derived by other authors are given for completeness. The quantities appropriate to the special case of Ce i are given in the text. The parentheses enclosing the result for Tb i are used to indicate the questionable nature of this result as discussed in the text.
N. I. Ionov and M.A. Mittsev, Zh. Eksperim. i Teor. Fiz. 40, 741 (1960) [Soviet Phys.—JETP 13, 518 (1961)].
N. I. Ionov and M. A. Mittsev, Zh. Eksperim. i Teor. Fiz. 38, 1350 (1960) [Soviet Phys.—JETP 11, 972 (1960)].
V. I. Vedeneev et al. Cleavage Energies of Chemical Bonds. Ionization Potentials and Electron Affinity. Handbook (Publishing House of the Academy of Sciences, USSR, Moscow, 1962)—AEC Translation 6302. This reference contains a correction to the value for Pr given in Ref. b.
N. I. Alekseev and D. L. Kaminskli, Zh. Tekhn. Fiz. 34, 1521 (1964) [Soviet Phys.—Tech. Phys. 9, 1177 (1965)].
Tables (3)
Table I
Values of the electrostatic parameters used for determination of the positions of the unperturbed centers of gravity.
Configuration
Parameter
Value (cm−1)
4fN6s7s
G3(4f6s)
200± 10
4fN6s7s
G3(4f7s)
35± 5
4fN6s8s
G3(4f8s)
20± 5
4fN6s7s
G0(6s7s)
830±200
4fN6s8s
G0(6s8s)
190± 50
4f5d26s
G2(5d6s)
1200±200
4f5d26s
G3(4f6s)
150± 50
Table II
Ionization energies of the neutral rare earths obtained by series calculations, and quantities involved in their determination. Values for La i and Gd i derived by other authors are given for completeness. The quantities appropriate to the special case of Ce i are given in the text. The parentheses enclosing the result for Tb i are used to indicate the questionable nature of this result as discussed in the text.
N. I. Ionov and M.A. Mittsev, Zh. Eksperim. i Teor. Fiz. 40, 741 (1960) [Soviet Phys.—JETP 13, 518 (1961)].
N. I. Ionov and M. A. Mittsev, Zh. Eksperim. i Teor. Fiz. 38, 1350 (1960) [Soviet Phys.—JETP 11, 972 (1960)].
V. I. Vedeneev et al. Cleavage Energies of Chemical Bonds. Ionization Potentials and Electron Affinity. Handbook (Publishing House of the Academy of Sciences, USSR, Moscow, 1962)—AEC Translation 6302. This reference contains a correction to the value for Pr given in Ref. b.
N. I. Alekseev and D. L. Kaminskli, Zh. Tekhn. Fiz. 34, 1521 (1964) [Soviet Phys.—Tech. Phys. 9, 1177 (1965)].