X-ray and Neutron Scattering Studies of Methyl Iodide Confined in GelTech$_{\copyright}$ Glass

X-ray diffraction and neutron scattering studies of methyl iodide confined in 200 {\AA} GelTech$_{\copyright }$ glass have revealed a never before observed intermediate solid phase of methyl iodide. Bulk methyl iodide has one phase transition below room temperature, at 207 K where it transitions from a liquid to an orthorhombic solid. Neutron scattering studies of the diffusion of methyl iodide confined in the 200 {\AA} pores show a transition from a liquid to a solid at 203 K. X-ray diffraction measurements support this finding and identify the transition as one from a liquid to the never before observed amorphous solid. The amorphous solid remains down to 168 K upon cooling at which point a second transition appears from the amorphous solid to an orthorhombic solid, which upon indexing is identical to the bulk.