  Experimental vibrational spectra (Raman and infrared absorption) of berberine
are obtained at room temperature. The vibrational spectra of berberine are
calculated by the DFT method at the B3LYP/6-311++G(d,p) level. Based on the
correlation between experimental and calculated data, the vibrational spectrum
is interpreted in the frequency range of 800-1700 cm-1 in detail. The
experimental and calculated spectra of intramolecular vibrations are found to
correlate closely
