Introduction to Vacuum Technology General Many surface scientists work with their samples in a vacuum system. The reasons for this are several fold: first, many samples react with the gases in ordinary room air which means they must be kept in a clean environment; second, the experimental probes used to measure sample properties may depend on electron or other beams that simply could not exist outside a vacuum. This guide will introduce you to basic terminology and technology for producing and maintaining vacuum conditions. Ambient pressure is defined as the current atmospheric pressure which
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