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Author Moon, Chang Sung ♦ Takeda, Keigo ♦ Takashima, Seigo ♦ Sekine, Makoto ♦ Hori, Masaru ♦ Setsuhara, Yuichi ♦ Joining ♦ Shiratani, Masaharu
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ABSORPTION SPECTROSCOPY ♦ AFTERGLOW ♦ FAR ULTRAVIOLET RADIATION ♦ HOLLOW CATHODES ♦ HYDROGEN ♦ LIFETIME ♦ NITROGEN ♦ PHOTONS ♦ PLASMA ♦ PLASMA DENSITY ♦ PLASMA DIAGNOSTICS ♦ RADICALS ♦ SURFACES ♦ THERMONUCLEAR REACTOR MATERIALS ♦ WALL EFFECTS ♦ X-RAY PHOTOELECTRON SPECTROSCOPY ♦ BOSONS ♦ CATHODES ♦ ELECTRODES ♦ ELECTROMAGNETIC RADIATION ♦ ELECTRON SPECTROSCOPY ♦ ELEMENTARY PARTICLES ♦ ELEMENTS ♦ MASSLESS PARTICLES ♦ MATERIALS ♦ NONMETALS ♦ PHOTOELECTRON SPECTROSCOPY ♦ RADIATIONS ♦ SPECTROSCOPY ♦ ULTRAVIOLET RADIATION
Abstract Surface loss probabilities of hydrogen (H) and nitrogen (N) radicals on different wall materials in H{sub 2}/N{sub 2} mixture plasmas have been investigated by employing vacuum ultraviolet (VUV) absorption spectroscopy with a high pressure microdischarge hollow cathode lamp as a light source. The surface loss probability of a radical was calculated by using the lifetime obtained from the decay curve of the radical density in afterglow plasmas. The surface loss probabilities on different walls in the H{sub 2}/N{sub 2} mixture plasmas were higher than those in a pure H{sub 2} or N{sub 2} plasma. The behaviors of species such as ions and VUV photons as a function of the gas mixture ratio were measured to investigate those influences on plasma-surface interactions. In addition, changes on the surface exposed to the plasma were analyzed by x-ray photoelectron spectroscopy. Quantitative measurements of surface loss probabilities of radicals on various wall materials are expected to be crucially important in achieving good understanding of the interaction between the surface and the plasma.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-05-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 107
Issue Number 10


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