Resonant Raman scattering and optical transmission studies of Cu(II) and Fe(III) impurities in crystalline L-alanine

E. WINKLER, P. ETCHEGOIN, A. FAINSTEIN, AND C. FAINSTEIN

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Año: 2000 vol. 61 p. 15759 - 15761

1098-0121

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.