An electron microscope liquid helium stage for use with accessories

Abstract

A stage for an electron microscope has been constructed which is stable and versatile. It is a two-axis tilting stage which will operate at temperatures between liquid helium temperature and 50°C. A surrounding shield at 80°K provides contamination protection. The specimen exchange mechanism is retained. An integral feature of the design is the provision for accessories which can be used without modification to the stage and without breaking the microscope vacuum. The stage and its performance are described. Two accessories in present use, an ion gun and a device used for studying condensed gases, are also described, and some results are shown.