Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3496041
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- Research Department 'Plasmas with Complex Interactions' of the Ruhr-Universitat Bochum
- German Research Foundation [SCHU 2353/2, FOR 1123, A1]
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We present clear evidence that ground state atomic oxygen shows two patterns near a surface in the helium plasma needle discharge. Two-photon absorption laser-induced fluorescence spectroscopy, combined with gas flow simulation, was employed to obtain spatially-resolved ground state atomic oxygen densities. When the feed gas flow rate is low, the radial density peaks along the axis of the needle. At high flow rate, a ring-shaped density distribution appears. The peak density is on the order of 10(21) m(-3) in both cases. The results are consistent with a previous report of the flow-dependent bacterial killing pattern observed under similar conditions. (C) 2010 American Institute of Physics. [doi:10.1063/1.3496041]
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