Measurements of helium metastable density in an atmospheric pressure glow discharge
- Physics Department, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland (United Kingdom)
The density of metastable helium atoms in a dielectric barrier discharge operating in helium with some impurities present has been measured using laser-collisional-induced fluorescence and absorption techniques. Time-resolved measurements indicate that helium metastables contribute to the production of impurity ions, in this case N{sub 2}{sup +}, in the postdischarge current phase of a glow discharge. In our particular discharge environment, the helium metastable density is (1.5{+-}1.4)x10{sup 10} cm{sup -3}, a result consistent with failure to observe absorption by metastables in a multipass absorption measurement.
- OSTI ID:
- 20632753
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 85; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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