The deposition of high-purity thin films at ordinary vacuum levels by using a getter to remove contaminants remaining in the vacuum.


Related Terms

POLARITY EFFECT

An effect for which the breakdown voltage across a vacuum separating two electrodes, one of which is pointed, is much higher when the pointed electrode is the anode.

PALLADIUM BARRIER LEAK DETECTOR

A type of leak detector in which hydrogen is diffused through a barrier of hot palladium into an evacuated vacuum gage.

OUTGASSING

The release of adsorbed or occluded gases or water vapor, usually by heating, as from a vacuum tube or other vacuum system.

MOLECULAR PUMP

A vacuum pump in which the molecules of the gas to be exhausted are carried away by the friction between them and a rapidly revolving disk or drum.

MOLECULAR DRAG PUMP

A vacuum pump in which pumping is accomplished by imparting a high momentum to the gas molecules by impingement of a body rotating at very high speeds, as mucha s 16,000 revolutions perminute;such pumps achieve a vacuum as high as 10^-6 torr.

MICROPHOTOMETER

A photometer that provides highly accurate illumination measurements; in one form, the changes in illumination are picked up by a phototube and converted into current variations that are amplified by vacuum tubes.

LOW-LEVEL CONDENSER

A direct-contact water-cooled steam condenser that uses a pump to remove liquid from a vacuum space.

INCANDESCENT LAMP

An electric lamp that produces light when a metallic filament is heated white-hot in a vacuum by passing an electric current through the filament. Also known as filament lamp; light bulb.

BITUMEN

Also called asphalt or tar, bitumen is the brown or black viscous residue from the vacuum distillation of crude petroleum. It also occurs in nature as asphalt 'lakes' and 'tar sands'. It consists of high molecular weight hydrocarbons and minor amounts of sulfur and nitrogen compounds.

VACUUM

Pressure lower than atmospheric pressure.

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