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Two-dimensional  T  1 - T  2  1 H NMR relaxation correlation spectra and  T  2 - T  2  relaxation exchange spectra for samples of spruce wood across the full moisture content range from 0% to &gt;100% are presented. The  T  1 - T  2  spectra unambiguously identify water in different environments within the wood that overlap in the corresponding and more traditional one-dimensional  T  1  or  T  2  experiment. The  T  2 - T  2  spectra unambiguously reveal the presence of water exchange between the lumen and cell wall above the fibre saturation point in sapwood. An estimate is made of the exchange rate: 1/30 to 1/3 ms -1 .

A study of water exchange in wood by means of 2D NMR relaxation correlation and exchange