Abstract
Infrared reflectivity was measured in situ from single phase layers of Rb1C60 with a thickness of about 4 μm on a {111} face and of about 0.5 μm on a {100} face of C60 single crystals. The fcc→orthorhombic phase transition was traced by a splitting of the F1u (4) mode into three lines within a temperature range of 2° at 404/415 K for a cooling/heating cycle, respectively. The reflectivity spectra remained unchanged after exposing the orthorhombic Rb1C60 to air. Even the fcc phase appears to be vibrationally stable in air up to at least 450 K. The conductivity of the orthorhombic phase shows a weakly activated temperature dependence.
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