Calculated versus curve-fit, experimental frequencies in the 900 to 1200 cm⁻¹ spectral region for dAMP adsorbed onto hematite versus goethite.

Experimental frequencies (cm−1)		Calculated frequencies (cm−1) and mode assignments
Hematite	Goethite	Monodendate	Monodendate mode assignment	Bidentate	Bidendate mode assignment
944	955	923	δ(P–OH)	913	ν(PO4)
989	995	981	δ(P–OH) and ν(PO–C)	990	ν(PO4) and ν(PO–C)
1058	1017	1027	ν(PO4) + sugar ring	1035	ν(PO4) and ν(PO–C)
1117	1079	1071	ν(PO4) + sugar ring	1092	ν(PO4) + sugar ring
1147	1144	1137	ν(PO4)	1104	ν(PO4) + sugar ring