Analysis of the Electronic Spectra of Neodymium Ethylsulfate

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Abstract
The polarized absorption spectra of single crystals of neodymium ethylsulfate [Nd(C2H5SO4)3·9H2O] have been studied between 11 000 cm—1 and 28 500 cm—1 at 77° and at 4.2°K. From the 77°K polarized absorption spectrum of crystals of different thicknesses, it is possible to identify transitions from all the Stark components of the ground level 4I9/2 to many of the Stark components of excited SLJ levels of the 4f3 configuration. The electronic transitions particularly of the 4I9/2 ground level are reliably singled out from among vibronic transitions. The experimental assignment based on selection rules and the number of transitions observed is further verified by a comparison of the experimental levels with the ``free‐ion'' spectrum predicted on the basis of the parameters F2=331.33 cm—1, F4=47.956 cm—1, F6=5.313 cm—1, and ζ=880.11 cm—1. A first‐order crystalline‐field splitting calculation based on the parameters B20=58.4 cm—1, B40=—68.2 cm—1, B60=—42.7 cm—1, and B66=595 cm—1 gives a predicted splitting to within a mean deviation of 4 cm—1.

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