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Raman spectra collected periodically following storage of T
H at 0% RH (60°C). The spectra of T
H and 
are provided for comparison. The 880–800 cm−1 range has been highlighted in the inset. The characteristic peak of 
(arrow) at 863 cm−1 was observed at 2 h. The 
transition appears to be complete in 8 h
