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Baseline-corrected transmission FTIR spectra of spruce wood. From bottom; in the dry state (H dry), then equilibrated with D2O (D wet) and then dried without access to H2O (D dry). Deuteration moved the O-H stretching bands from accessible hydroxyl groups (3,200–3,500 cm-1) to the O-D stretching region (2,300–2,600 cm-1). Difference spectra show effects of deuteration (H dry—D dry) and of drying in the deuterated state (D wet—D dry). Top: polarized spectra after deuteration and drying.
