Energy-transfer processes in decaying helium-copper gaseous plasmas

D. W. Ernie, H. J. Oskam

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The time dependences of 35 Cu II energy levels between 15.96 and 24.62 eV were studied using light emission and absorption spectroscopy during the afterglow of a sputtered He-Cu hollow cathode discharge. By measuring the decay of the Hem(2S3) and Cu(4sS122) densities, it was possible to determine the helium species [He+, He2+, Hem(2S3), and He2m(au+3)] responsible for production of the Cu II states. The Cu II levels between 22.7 and 24.62 eV are produced, either directly or by cascading, by charge exchange between He+ and Cu. The Cu II levels between 15.96 and 21.41 eV are produced by charge exchange between He2+ and Cu. No evidence was found for the production of Cu II states by the Penning ionization of Cu by Hem(2S3) or He2m(au+3). A value of 43010 cm2 sec-1 Torr was measured for the diffusion coefficient of Cu(4sS122) in helium. The time dependence of the sputtered Cu(4sS122) radial density profile was also investigated theoretically during the discharge sequence.

Original languageEnglish (US)
Pages (from-to)325-333
Number of pages9
JournalPhysical Review A
Issue number1
StatePublished - 1981


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