A comparative study by means of resonant Raman scattering and optical transmission spectroscopy between the different color centers originating from Fe(III) and Cu(II) doping of L-alanine crystals is presented. In both samples we find a selective resonant enhancement of Raman active modes related to vibrations of the lattice and carboxyl group. We found that Cu(II)- and Fe(III)-doped samples have qualitatively similar electronic absorptions, but they display different effects on the resonant profiles of the phonons. Fe(III)-doped samples show an antiresonance behavior for some modes, something that is not observed in samples with Cu(II) impurities.
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Winkler et al. (2000) studied this question.
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