X-ray impact induced desorption of gases from stainless steel surfaces

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During the operation of plasma devices the interaction of energetic photons with surfaces can cause gas release by photodesorption, and thereby contribute to plasma contamination. Measurements of gases released from stainless steel surfaces were made in an ultrahigh vacuum environment using x- rays characteristic for a tungsten target bremsstrahlung spectrum for electron energies varying from 15 to 50 keV. The predominant gas species observed mass spectrometically are CO$sub 2$ (m/e = 44), CO (m/e = 28), and O$sub 2$ (m/e = 32). Mean quantum yields for the release of these species from stainless steel were determined. For example, for fresh ... continued below

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8 p.

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Brumbach, S. & Kaminsky, M. January 1, 1975.

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During the operation of plasma devices the interaction of energetic photons with surfaces can cause gas release by photodesorption, and thereby contribute to plasma contamination. Measurements of gases released from stainless steel surfaces were made in an ultrahigh vacuum environment using x- rays characteristic for a tungsten target bremsstrahlung spectrum for electron energies varying from 15 to 50 keV. The predominant gas species observed mass spectrometically are CO$sub 2$ (m/e = 44), CO (m/e = 28), and O$sub 2$ (m/e = 32). Mean quantum yields for the release of these species from stainless steel were determined. For example, for fresh stainless steel surfaces irradiated by x-rays produced by 50 keV electrons, a mean quantum yield for molecular CO$sub 2$ release of 3 x 10$sup -4$ molecules per photons in a bremsstrahlung spectrum at 50 keV electron energy was observed. Based on such a quantum yield an outgassing rate was determined. (auth)

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8 p.

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Dep. NTIS

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  • IEEE 6. symposium on engineering problems of fusion research, San Diego, California, USA, 17 Nov 1975

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  • Report No.: CONF-751125--71
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 4125770
  • Archival Resource Key: ark:/67531/metadc864221

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 11, 2017, 2:38 p.m.

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Brumbach, S. & Kaminsky, M. X-ray impact induced desorption of gases from stainless steel surfaces, article, January 1, 1975; Illinois. (digital.library.unt.edu/ark:/67531/metadc864221/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.