Table 3: Progress in the Optical Density Values of the Assignment Groups on Sr-c-SBF, Measured According to Kubelka-Munk Function

Sr-c-SBF
Group Assignment	Wavenumber 1/λ cm-1	“Kubelka-Munk” Units
		Sr-2p	Sr-3p	Sr-4p	Sr-5p
OH stretching vibration	3387	0.124	0.123	2.043	2.149
OH bending vibration	623 - 667	0.011	0.010	0.705	0.463
H-O-H scissors	1645	0.011	0.032	0.827	0.572
“C-O” stretch ν3	1394 - 1406	1.636	1.179	1.553	1.413
“out-of-plane” C-O bending vibration ν2	873	0.365	0.290	0.243	0.085
“in-plane” C-O bending vibration	710	0.023	0.018	0.051	0.057
PO43- stretching vibration ν3	1077	0.108	0.182	1.274	1.171
PO43- stretching vibration ν1	973	0.028	0.074	0.090	0.147
PO43- bending vibration ν4	562	0.008	0.014	0.038	0.088
PO4-3 bending vibration ν2	494	0.004	0.037	0.002	0.020
HPO4-2	767	0.010	0.004	0.007	0.021