We have studied the resonance Raman spectra of β-carotene in solution and in protein-complexes using laser excitation at various wavelengths in the visible region. Main focus was laid on the v 1 -band, which shows an anomalous behaviour upon variation of the excitation wavelength resulting in a frequency shift of the peak maximum. This shift is due to different excitation profiles of two closely spaced modes as shown previously for β-carotene in solution. In this work, we have extended the studies to the antenna pigment in photosystems I and II (PS I and PS II).