The resonance Raman excitation profiles for the ngr;1, ngr;2, and ngr;3vibrations of violaxanthin in acetone, toluene, and carbon disulfide solvents have been measured. The results are interpreted in terms of a threehyphen;mode vibrational theory which includes both homogeneous and inhomogeneous broadening effects. Excellent agreement between calculated and observed excitation profiles and visible spectra was found in all three solvents. The broadening mechanism is exclusively homogeneous. The results also indicate that the excitedhyphen;state vibrational frequencies may be important in the theoretical model.
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