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Difference FT-IR spectra of calcium-containing (black traces) and strontium-exchanged (red traces) in the 1800–1200 cm−1 region. The spectra are associated with the S1′ to S2′ (A), S2′ to S3′ (B), S3′ to S0′ (C), and S0′ to S1′ (D) transitions. In E, a dark-minus-dark control is presented. The tick marks on the y axis are 2 × 10−4 absorbance units. The red traces are labeled.
