Lattice Vibrations and Specific Heats of Several Rare‐Earth Ethylsulfates

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Abstract
The vibronic absorption spectra of praseodymium, neodymium, and erbium ethylsulfate were used to construct tentative vibrational energy‐level diagrams for the crystals. With this technique, 42 levels ranging from 18 to 360 cm—1 were identified. The energy‐level spectra were used to calculate the specific heat of the crystals from 0° to 15°K as an additional check on the origin of the observed absorption spectra and fair to good agreement with measured specific heats was achieved.