The usefulness of the electro-optically tuned wavelength-modulated cw dye laser for derivative spectroscopy of solids is demonstrated. The derivative spectrum corresponding to the 4I9/2→4G5/2 + 2G7/2 transitions of the trivalent neodymium ion in crystalline YAG at room temperature was studied and new features were observed.
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Tang et al. (1974) studied this question.
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