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. 2023 Sep 16;14:5752. doi: 10.1038/s41467-023-41533-x

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© The Author(s) 2023

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Fig. 2 — The H₂¹⁶O-H₂¹⁸O difference spectrum (expanded by 5-fold) is shown in black at the bottom. The oxygen sensitive mode in the H₂¹⁶O sample centered at 451 cm⁻¹ that shifted to 428 cm⁻¹ in the H₂¹⁸O sample is assigned to the ν_Fe-OH mode.