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P: Plasmaphysik

P 16: Plasma Diagnostics

P 16.3: Vortrag

Donnerstag, 20. März 2003, 16:10–16:30, FO2

On Spectroscopic Determination of the Dissociation Degree of Hydrogen in Arc Discharge — •A.V. Pipa^1,2, B.P. Lavrov², and J. Röpcke¹ — ¹Institut für Niedertemperatur-Plasmaphysik, 17489 Greifswald, Germany — ²Institute of Physics, St.-Petersburg State University, 198904, Russia

The methods of spectroscopic determination of the dissociation degree of hydrogen based on measurements of Hα/Hβ intensity ratios [1] and ratios of Hα, Hβ to the Q1 line of the (2-2) Fulcher-α band together with gas temperature [2] have been extended to use Q1 line intensities of other Fulcher-α bands (0-0, 1-1, 3-3). Special attention is paid to accurate consideration of the unresolved fine structure of atomic lines and the rotational structure of molecular bands. The methods have been applied in studies of a low-pressure, non-equilibrium, pure hydrogen plasma of an arc discharge surrounded by metal surfaces, which showed a rather low dissociation degree of about 0.5%. Results thus obtained are presented and discussed.

[1] V. Schulz-von der Gathen, H.F. Döbele Plasma Chem. Plasma Process. 16 (1995) 461

[2] A.V. Pipa, N. Lang, B.P. Lavrov, J. Röpcke VII. ECAMP Berlin 2001, Verhandlg. d. DPG, 5/2001, 169