Berlin 2005 – scientific programme

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P: Plasmaphysik

P 2: Niedertemperaturplasmen / Plasmatechnologie 1

P 2.3: Talk

Friday, March 4, 2005, 11:45–12:00, HU 3038

Limitations of Bartels’ method for temperature determination in metal-halide arc lamps with self-reversed spectral lines — •H. Schneidenbach, St. Franke, H. Schöpp, and R. Methling — INP Greifswald, F.-L.-Jahn-Str. 19, D-17489 Greifswald, Germany

Self-reversed lines play an important role for diagnostics of high-pressure lamp plasmas. The temperature profile of a plasma column can be determined by the Bartels method [1] from the reversal maxima of the side-on measured line intensities. The method implies some conditions like LTE, constant partial radiator pressure, line shift neglect and exclusion of resonance lines as well as lines with low excitation energy of the lower level. The Bartels parameters have been analyzed for cases without these limitations with given temperature profiles and plasma compositions. Special attention has been turned to the influence of temperature plateaus in the peripheral discharge areas. Some basic aspects have been discussed in comparison with the method described by Karabourniotis [2].

[1] H. Bartels, Z. Physik 128 (1950) 546

[2] D. Karabourniotis, J. Phys. D: Appl. Phys. 16 (1983) 1267