A. Jillavenkatesa et Ra. Condrate, THE INFRARED AND RAMAN-SPECTRA OF TETRACALCIUM PHOSPHATE (CA4P2O9), Spectroscopy letters, 30(8), 1997, pp. 1561-1570
The infrared and Raman spectra of tetracalcium phosphate (Ca4P2O9) wer
e measured and interpreted on the basis of factor group analysis. Fact
or group splitting can be noted for the various internal vibrational m
odes of the PO43- ion. However, a fewer number of factor group-split b
ands can be seen than predicted because of either the weak intensities
of these bands or the convolution of such bands for the various inter
nal modes of vibration.