The use of organic materials in metal high-vacuum systems is often objectionable, particularly with instruments such as mass spectrometers where the presence of rubber, vacuum grease, and even Teflon made themselves known by the many background hydrocarbon speaks that appear throughout the spectrum.nWe have employed successfully for some time several ideas concerning the used of indium and indium-coated copper as suitable gasket material. In addition, we have developed a simple yet novel valve employing indium that does not use organic material as vacuum seal.
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