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3 - VACUUM TECHNOLOGY

Published online by Cambridge University Press:  05 August 2012

John H. Moore ,
Christopher C. Davis  and
Michael A. Coplan
With contributions by
Sandra C. Greer
John H. Moore
Affiliation:
University of Maryland, College Park
Christopher C. Davis
Affiliation:
University of Maryland, College Park
Michael A. Coplan
Affiliation:
University of Maryland, College Park
Sandra C. Greer
Affiliation:
Mills College, California
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Summary

In the modern laboratory, there are many occasions when a gas-filled container must be emptied. Evacuation may simply be the first step in creating a new gaseous environment. In a distillation process, there may be a continuing requirement to remove gas as it evolves. Often it is necessary to evacuate a container to prevent air from contaminating a clean surface or interfering with a chemical reaction. Beams of atomic particles must be handled in vacuo to prevent loss of momentum through collisions with air molecules. Many forms of radiation are absorbed by air and thus can propagate over large distances only in a vacuum. A vacuum system is an essential part of laboratory instruments such as the mass spectrometer and the electron microscope. Far infrared and far ultraviolet spectrometers are operated within vacuum containers. Simple vacuum systems are used for vacuum dehydration and freeze-drying. Nuclear particle accelerators and thermonuclear devices require huge, sophisticated vacuum systems. Many modern industrial processes, most notably semiconductor device fabrication, require carefully controlled vacuum environments.

GASES

The pressure and composition of residual gases in a vacuum system vary considerably with its design and history. For some applications a residual gas density of tens of billions of molecules per cubic centimeter is tolerable. In other cases no more than a few hundred thousand molecules per cubic centimeter constitutes an acceptable vacuum: “One man's vacuum is another man's sewer”.

Type
Chapter
Information
Building Scientific Apparatus , pp. 93 - 146
Publisher: Cambridge University Press
Print publication year: 2009

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