UHV Outgassing Measurements on Various Carbons

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Abstract
Mass spectral analyses were made of gases desorbed from carbon samples at increasing temperatures up to 2200 °K. Samples were initially outgassed above 2000 K, exposed to air for several hours at room temperature, and then tested in ultrahigh vacuum following a 24-hr bake at 300 °C. Four forms of carbon were tested (a) pyrolytic carbon, (b) Grafoil™ (Union Carbide), (c) vitreous carbon, and (d) pyrolyzed-phenolic fibers. The equivalent of several monolayers of gas (mostly H2 and CO) are evolved from all of the carbons except vitreous carbon. Less than a monolayer of gas is evolved from vitreous carbon during outgassing to 2000 K.

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