Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Raman spectra collected periodically following storage of T
H at 11% RH (60°C). The spectra of T
H and 
are provided for comparison. The 950–820 cm−1 range has been highlighted in the inset. The type 1 band of 
appeared at 34 h of storage. At the same time, the type 2 band of T
H shifted to a lower wavenumber (characteristic of 
) and its shoulder developed into a peak at 848 cm−1
