Emission Spectroscopy in Optically Thick Gas Discharges

Karabourniotis, D.

doi:10.1007/978-1-4615-3786-1_7

Cited by 1 publication

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“…A typical example is Bartels method whose application for electron temperature determination presupposes excitation equilibrium and a dispersion-type local line profile. 4 In an enclosed plasma of the high-pressure mercury discharge type operated vertically, the mercury vapor of a temperature of about 1000 degrees near the tube wall is drawn by convection currents into the central discharge channel where it is heated up to several thousands degrees. The mercury atoms are then available for ionization, excitation, and emission of radiation by deexcitation.…”

Section: Introductionmentioning

confidence: 99%

Determination of the radial density distribution of ground and low-lying levels of mercury in a nonequilibrium plasma using emission spectroscopy

Karabourniotis

2001

Journal of Applied Physics

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A method is described for determining the radial density distribution of the ground and the first excited states as well as the electron temperature distribution in multielement plasmas containing mercury. It is based on the spectroscopic measurement of the plasma emissivity at the maximum of self-reversed lines and the population density of a high-lying excited state. The method is independent of equilibrium assumptions and can be used in diagnostics of nonequilibrium plasmas. The proposed method was verified for the plasma of a 5 bar discharge in mercury. Plasma underionization and nonequilibrium excitation are observed spectroscopically in the bulk of the discharge. The experimental data are interpreted in terms of nonequilibrium effects. Comparison of the results obtained initially, and then assuming local thermodynamic equilibrium ͑LTE͒, shows clearly considerable departure of the plasma from LTE.

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Section: Introductionmentioning

confidence: 99%