Configuration‐Interaction Effects on the ``Free‐Ion'' Energy Levels of Nd3+ and Er3+

By the use of three or four parameters of configuration interaction, the experimental ``free‐ion'' energy levels of Nd3+ and Er3+ have been fitted with an rms deviation of 45–55 cm−1. The significance of the various parameter values is discussed. It is also shown that assignments based purely on comparison with a calculation using only F2, F4, F6, and ζ may occasionally be in error. Several discrepancies in previous work are now cleared up.

[1]  G. Dieke,et al.  The State of the Nd3+ Ion as Derived from the Absorption and Fluorescence Spectra of NdCl3 and Their Zeeman Effects , 1961 .

[2]  B. G. Wybourne,et al.  Configuration Interaction in Crystal Field Theory , 1964 .

[3]  K. Rajnak.  Configuration Interaction in the 4f 3 Configuration of Pr iii , 1964 .

[4]  Erratum: Energy Levels of Er3+ in LaF3 and Coherent Emission at 1.61 μ , 1965 .

[5]  E. Wong,et al.  Absorption Spectrum of Nd3+ in LaBr3 , 1962 .

[6]  B. G. Wybourne,et al.  Spectra of Trivalent Praseodymium and Thulium Ions , 1959 .

[7]  H. Kahle.  Spektrum, Zeeman-Effekt und Elektronenterme des dreiwertigen Erbiums in kristallinen Salzen , 1961 .

[8]  Edward H. Erath.  Crystal Field Parameters for Erbium in Er (C2H5SO4)3·9H2O , 1961 .

[9]  G. Racah,et al.  Theory of Complex Spectra. IV , 1942 .

[10]  B. G. Wybourne,et al.  Electrostatically Correlated Spin-Orbit Interactions in l N -Type Configurations , 1964 .

[11]  G. Dieke,et al.  Infrared Absorption Spectrum of NdCl3 , 1960 .

[12]  G. Dieke,et al.  Energy Levels of Hexagonal ErCl3 , 1962 .

[13]  G. Dieke,et al.  Absorption and Fluorescence Spectra with Magnetic Properties of ErCl3 , 1961 .

[14]  B. Judd.  An analysis of the fluorescence spectrum of neodymium chloride , 1959, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[15]  J. Margolis.  Energy Levels of PrCl3 , 1961 .

[16]  B. G. Wybourne.  Composition of the Electronic States of Nd(IV) and Er(IV) , 1961 .