- A getter is a deposit of reactive material that is placed inside a vacuum system, for the purpose of completing and maintaining the vacuum
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Getter facts
- When gas molecules strike the getter material, they combine with it chemically or by absorption
- Thus the getter removes small amounts of gas from the evacuated space
- The getter is usually a coating applied to a surface within the evacuated chamber
- A vacuum is initially created by connecting a closed container to a vacuum pump
- After achieving a vacuum, the container can be sealed, or the vacuum pump can be left running
- Getters are especially important in sealed systems, such as vacuum tubes, including cathode ray tubes (CRTs), and vacuum insulated panels, which must maintain a vacuum for a long time
- This is because the inner surfaces of the container release absorbed gases for a long time after the vacuum is established
- The getter continually removes this residual gas as it is produced
- Even in systems which are continually evacuated by a vacuum pump, getters are also used to remove residual gas, often to achieve a higher vacuum than the pump could achieve alone
- Although it weighs almost nothing and has no moving parts, a getter is itself a vacuum pump
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