| 1. | :You don't need a particularly sturdy container to contain ultra high vacuum.
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| 2. | Older instruments may have used oil diffusion pumps for high vacuum regions.
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| 3. | Such pumps inexpensively and reliably produce extremely low pressures in ultra-high vacuum systems.
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| 4. | These metals are therefore relatively volatile, and are avoided in ultra-high vacuum systems.
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| 5. | In electron microscopy ( EM ), samples are imaged in an ultra-high vacuum.
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| 6. | High vacuum also eliminates oxidation that might occur in the presence of air.
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| 7. | Dicoronylene sublimes under high vacuum, 0.001 torr, between 250 �C and 300 �C.
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| 8. | After preparation, it is usually purified by high temperature sublimation under high vacuum.
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| 9. | Ultra-high vacuum systems are usually made of stainless steel with metal-gasketed vacuum flanges.
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| 10. | Stopcock grease is always used in high vacuum applications to make the stopcock air-tight.
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