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Reconstruction of an electron energy distribution function using integrated data analysis

Dirk Dodt1, Andreas Dinklage1, Rainer Fischer2, Klaus Bartschat3, Oleg Zatsarinny3 and Detlef Loffhagen4

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The non-Maxwellian electron energy distribution function (EEDF) in the positive column of a neon dc-discharge was reconstructed from the visible emission spectrum obtained with an overview spectrometer. The analysis is based on Bayesian probability theory (integrated data analysis), which allows for the use of the full information in the spectral data by incorporating all important underlying physical mechanisms. The data are described by a collisional–radiative model and a statistical description of the spectroscopic measurement. An extensive and consistent set of electron impact excitation cross sections and Einstein coefficients obtained through semi-relativistic B-Spline R-Matrix calculations is employed, and estimates for uncertainties are included in the analysis. The results are consistent with theoretical modelling and reference measurements.


PACS

52.70.Kz Optical (ultraviolet, visible, infrared) measurements

52.20.Fs Electron collisions

52.25.Os Emission, absorption, and scattering of electromagnetic radiation

52.80.-s Electric discharges

Subjects

Instrumentation and measurement

Plasma physics

Dates

Issue 20 (21 October 2008)

Received 11 June 2008, in final form 20 August 2008

Published 25 September 2008



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