Laser pulse induced photo-detachment combined with Langmuir probing has been introduced to diagnose plasma electronegativity. This technique uses a laser pulse to convert negative ions into electron-atom pairs and tracks the change of electron saturation current by a Langmuir probe. The existing model determines plasma electronegativity as the ratio of electron saturation current before and after detachment. However, this model depends on various assumptions and neglects the formation of a potential barrier between the laser channel and surrounding electronegative plasma. In this letter, we present a new analytical model to analyze photo-detachment signals in order to improve the accuracy of electronegativity measurements and extend this technique for measuring electron temperature and charged species density. This analytical model is supported by Particle-In-Cell simulation of electronegative plasma dynamics following laser photo-detachment. The analysis of the signal, detected on a simulated probe, shows that the present analytical model determines electronegativity, electron temperature, and plasma density with a relative error of ∼20%, ∼20%, and ∼50%, respectively, whereas the electronegativity obtained from a previous model is underestimated by an order of magnitude.
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19 September 2016
Research Article|
September 21 2016
Photo-detachment signal analysis to accurately determine electronegativity, electron temperature, and charged species density
N. Oudini
;
N. Oudini
a)
1Laboratoire des plasmas de décharges,
Centre de Développement des Technologies Avancées
, Cité du 20 Aout BP 17 Baba Hassen, 16081 Algiers, Algeria
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N. Sirse;
N. Sirse
2Plasma Research Laboratory, School of Physical Sciences and NCPST,
Dublin City University
, Dublin 9, Ireland
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F. Taccogna;
F. Taccogna
3
CNR-Nanotec-P.Las.M.I. lab
, via Amendola 122/D, 70126 Bari, Italy
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A. R. Ellingboe;
A. R. Ellingboe
2Plasma Research Laboratory, School of Physical Sciences and NCPST,
Dublin City University
, Dublin 9, Ireland
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A. Bendib
A. Bendib
4
Laboratoire d'Electronique Quantique
, Faculté de Physique, USTHB, El Alia BP 32, Bab Ezzouar 16111, Algiers, Algeria
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a)
Author to whom correspondence should be addressed. Electronic mail: noudini@cdta.dz
Appl. Phys. Lett. 109, 124101 (2016)
Article history
Received:
July 10 2016
Accepted:
September 08 2016
Citation
N. Oudini, N. Sirse, F. Taccogna, A. R. Ellingboe, A. Bendib; Photo-detachment signal analysis to accurately determine electronegativity, electron temperature, and charged species density. Appl. Phys. Lett. 19 September 2016; 109 (12): 124101. https://doi.org/10.1063/1.4963138
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