| 1. | The diffusion pump is widely used in both industrial and research applications.
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| 2. | Older instruments may have used oil diffusion pumps for high vacuum regions.
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| 3. | The oil diffusion pump is operated with an oil of low vapor pressure.
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| 4. | Most modern diffusion pumps use silicone oil or polyphenyl ethers as the working fluid.
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| 5. | The two main types of molecular pumps are the diffusion pump and the turbomolecular pump.
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| 6. | The outside of the diffusion pump is cooled using either air flow or a water line.
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| 7. | One major disadvantage of diffusion pumps is the tendency to backstream oil into the vacuum chamber.
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| 8. | Unlike turbomolecular pumps and cryopumps, diffusion pumps have no moving parts and as a result are quite durable and reliable.
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| 9. | Data presented in Table 3 demonstrates polyphenyl ether to be superior to other fluids that are commonly used in diffusion pumps.
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| 10. | An oil diffusion pump is used to achieve higher vacuum ( lower pressure ) than is possible by use of positive displacement pumps alone.
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