Abstract
For X-ray investigations of structural changes in solids (including extremely air sensitive substances, frozen liquids or condensed gases) as a function of temperature a moving film camera has been developed on the basis of a modified Guinier technique. Temperatures can be maintained to within ±0.05°C from −1190° to 400 °C. The phase transitions occurring in solid hydrogen bromide have been investigated with the new camera. HBr is shown to crystallize in two orthorhombic low temperature and two face-centered cubic high temperature phases.
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