Puzzling differences in bismuth and lead plasmas: evidence for thesignificant role of neutrals in cathodic vacuum arcs

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Time-dependent ion charge state measurements for Pb and Bicathodic arc plasmas revealed unexpectedly strong differences: the meanBi ion charge state dropped much stronger and with a longer time constantthan the mean Pb ion charge state. It is shown that the difference inthermal conductivity led to much higher vapor pressure for Bi, which inturn much more effectively caused charge exchange collisions. The resultshave implications beyond Pb and Bi plasmas, most importantly that the"true" charge states as emitted from the cathode spot are higher thanwhat is generally measured and published.

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Anders, Andre & Yushkov, Georgy Yu. May 10, 2007.

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Time-dependent ion charge state measurements for Pb and Bicathodic arc plasmas revealed unexpectedly strong differences: the meanBi ion charge state dropped much stronger and with a longer time constantthan the mean Pb ion charge state. It is shown that the difference inthermal conductivity led to much higher vapor pressure for Bi, which inturn much more effectively caused charge exchange collisions. The resultshave implications beyond Pb and Bi plasmas, most importantly that the"true" charge states as emitted from the cathode spot are higher thanwhat is generally measured and published.

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  • Journal Name: Applied Physics Letters; Journal Volume: 102; Journal Issue: 4; Related Information: Journal Publication Date: 08/20/2007

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  • Report No.: LBNL--62639
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 918637
  • Archival Resource Key: ark:/67531/metadc886838

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  • May 10, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 30, 2016, 12:38 p.m.

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Anders, Andre & Yushkov, Georgy Yu. Puzzling differences in bismuth and lead plasmas: evidence for thesignificant role of neutrals in cathodic vacuum arcs, article, May 10, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc886838/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.