Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1567557 | Journal of Nuclear Materials | 2009 | 4 Pages |
Abstract
The ground-state vibrational temperature of hydrogen molecules, Tvib, is observed in detached plasma using a VUV spectrometer on a linear plasma device, TPD-SheetIV. Tvib was deduced by applying the corona equilibrium model by using the electron impact excitation rate and the spontaneous emission coefficient, taking into account the cascade contribution of E,F1Σg+ and the radiation trapping. Tvib can be found which results in a fit to the observed relative intensities of VUV spectrum in the range from 90 to 150 nm. With increasing gas pressure P, Tvib gradually decreases from 5000 to 3000 K and remains nearly constant at around 1000 K in detached plasma at discharge current of 50 A.
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Authors
A. Nakanowatari, A. Tonegawa, T. Shibuya, K. Kawamura,