Modified apparatus for low temperature/high pressure Mössbauer absorber studies

Abstract

A method is described in which a system designed to study Mossbauer sources as a function of pressure and temperature is modified to include absorbers as well. This is accomplished by coupling the Mossbauer source, mounted inside a cryostat, to an external transducer by means of a bellows. In addition, a simple modification has converted an existing helium Dewar to a dynamic gas flow cryostat. Temperature can be continuously varied from 300 to 20 K at pressures up to 200 kilobars.

Moessbauer spectroscopy

“…The glass cryostat described by Pasternak and Shamai (244) avoids the difficulty of sealing mylar windows to a ground open-end glass surface by using a special lower metal section that is sealed to the glass. Other Dewars that have been described are those for varying the temperature (54), using a magnet system (36), and changing high pressures (193).…”