Fig. 1
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Top IR spectrum: residue of Exp. 2 at the moment of removal from high vacuum chamber. Middle IR spectrum: Residue of Exp. 2 after 5 days in storage under N2 atmosphere at 20∘C. The bands related to HMT diminish with storage time, pointing out the importance of the analysis time, as well as storage conditions. Bottom IR spectrum: HMT standard (Sigma-Aldrich 99%).
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