A liquid helium stage for the Philips EM 300 electron microscope

Abstract
A liquid helium stage for the Philips EM 300 electron microscope is described. The stage, which makes use of an external reservoir for liquid helium, enables a temperature of less than 9 K to be obtained at the specimen. The 31/2 1 of liquid helium used to fill the reservoir is sufficient for about 21/2 h of low-temperature operation.

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