Issue Eur. Phys. J. Appl. Phys. Volume 47, Number 1, July 2009 4th Colloquium Interdisciplinary in Instrumentation (C2I) Article Number 11001 Number of page(s) 3 Section Plasma, Discharges and Processes DOI 10.1051/epjap/2009104 Published online 05 June 2009

Eur. Phys. J. Appl. Phys. 47, 11001 (2009)
DOI: 10.1051/epjap/2009104

Comment on “Diagnostics of 13.56 MHz RF sustained Ar-N₂ plasma by optical emission spectroscopy" by F.U. Khan, N.U. Rehman, S. Naseer, M.A. Naveed, A. Qayyum, N.A.D. Khattak and M. Zakaullah

N. Sadeghi^{1, 2} and F.J. Gordillo-Vazquez<sup>3

1</sup>  Laboratoire de Spectrométrie Physique, Université Joseph Fourier and CNRS, BP 87, 38402 Saint Martin d'Hères, France
²  Laboratoire des Technologies de la Microélectronique, CNRS, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France
³  Instituto de Astrofísica de Andalucia, CSIC, P.O. Box 3004, 18080 Granada, Spain

Nader.Sadeghi@ujf-grenoble.fr

Received: 9 March 2009 / Accepted: 24 april 2009 / Published online: 5 June 2009

Abstract
Several important errors and misinterpretations present in a recent publication by Khan et al. [Eur. Phys. J. Appl. Phys. 45, 11002 (2009)] are pointed out and discussed. In particular, it is shown that the method used to calculate the rate coefficients for the electron impact excitation of 3p⁵4p and 3p⁵5p states of argon is incorrect and leads to unrealistically high rate coefficients.

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

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