Helium line intensity ratio in microwave-generated plasmas


Autoria(s): Podder, N. K.; Johnson, J. A.; Raynor, C. T.; Loch, S. D.; Ballance, C. P.; Pindzola, M. S.
Data(s)

2004

Resumo

The line intensity ratio method provides a nonintrusive diagnostic for the measurement of electron temperature in microwave-generated plasmas. For optically thin plasmas of low density, a line intensity method using He I lines can often be used, and is based on the fact that the electron impact excitation rate coefficients for helium singlet and triplet states are insensitive to electron density but differ as a function of the electron temperature. Line intensity measurements are presented from microwave-generated helium plasmas. Both steady-state corona and collision-radiative theoretical models are used to evaluate the ground and excited state populations. The line ratio versus electron temperature obtained from both of these methods are compared with the results from measurements. However, it is not possible to diagnose the electron temperature from the line ratios alone due to the presence of significant opacity and nonnegligible 1s2s S-3 metastable fraction in the plasma. (C) 2004 American Institute of Physics.

Identificador

http://pure.qub.ac.uk/portal/en/publications/helium-line-intensity-ratio-in-microwavegenerated-plasmas(063b5858-f8f0-4145-9938-2eec4ade414f).html

http://dx.doi.org/10.1063/1.1812535

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Podder , N K , Johnson , J A , Raynor , C T , Loch , S D , Ballance , C P & Pindzola , M S 2004 , Helium line intensity ratio in microwave-generated plasmas . in Physics of Plasmas . Physics of Plasmas , vol. 11 , pp. 5436-5443 . DOI: 10.1063/1.1812535

Tipo

contributionToPeriodical