Erosion of thin carbon foils by 20 keV and 40 keV Ar{sup +} irradiation

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Nominal 2 {mu}g/cm{sup 2} C foils were irradiated with 20 and 40 keV Ar{sup +} ions at fluences up to 1.1x10{sup 16} Ar{sup +}/cm{sup 2}. Foil erosion (determined by measuring changes in angular scatter distribution of 2-keV protons transiting the foil) is observed to reach a constant rate of 3.5 C atoms removed per incident Ar{sup +}. The independence of the sputter yield on foil thickness indicates that interactions leading to sputtering occur within a depth of 0.5 {mu}g/cm{sup 2} of the sputter surface. Using theoretical and TRIM estimates for the backwater sputtering yield, the transmission sputtering yield is a ... continued below

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15 p.

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Funsten, H.O. & Shappirio, M. October 1, 1996.

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Description

Nominal 2 {mu}g/cm{sup 2} C foils were irradiated with 20 and 40 keV Ar{sup +} ions at fluences up to 1.1x10{sup 16} Ar{sup +}/cm{sup 2}. Foil erosion (determined by measuring changes in angular scatter distribution of 2-keV protons transiting the foil) is observed to reach a constant rate of 3.5 C atoms removed per incident Ar{sup +}. The independence of the sputter yield on foil thickness indicates that interactions leading to sputtering occur within a depth of 0.5 {mu}g/cm{sup 2} of the sputter surface. Using theoretical and TRIM estimates for the backwater sputtering yield, the transmission sputtering yield is a factor of 3-16 times larger than the backward sputtering yield. The fraction of holes created in the foil by Ar{sup +} irradiation linearly increases with fluence above a fluence of 4x10{sup 15} Ar{sup +}/cm{sup 2}, and the foil lifetime is 8.7x10{sup 15} Ar{sup +}/cm{sup 2}.

Physical Description

15 p.

Notes

INIS; OSTI as DE96014934

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  • IBMM `96: 10. international conference on ion beam modification of materials, Albuquerque, NM (United States), 1-6 Sep 1996

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  • Other: DE96014934
  • Report No.: LA-UR--96-3096
  • Report No.: CONF-960994--8
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 383514
  • Archival Resource Key: ark:/67531/metadc674913

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  • October 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:22 p.m.

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Funsten, H.O. & Shappirio, M. Erosion of thin carbon foils by 20 keV and 40 keV Ar{sup +} irradiation, article, October 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc674913/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.