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|Título : ||Liquid sampling-atmospheric pressure glow discharge as a secondary excitation source: Assessment of plasma characteristics|
|Autor : ||Manard, Benjamin T.|
Gonzalez, Jhanis J.
Russo, Richard E.
Kenneth Marcus, R.
|Palabras clave : ||LS-APGD Laser ablation Liquid sampling-atmospheric pressure glow discharge|
|Fecha de publicación : ||3-Jun-2015|
|Resumen : ||The liquid sampling-atmospheric pressure glow discharge (LS-APGD) has been assessed as a secondary excitation
source with a parametric evaluation regarding carrier gas flow rate, applied current, and electrode distance.
With this parametric evaluation, plasmaopticalemission was monitored in order to obtain a fundamental understanding
with regards to rotational temperature (Trot), excitation temperature (Texc), electron number density
(ne), and plasma robustness. Incentive for these studies is not only for a greater overall fundamental knowledge
of the APGD, but also in instrumenting a secondary excitation/ionization source following laser ablation (LA). Rotational
temperatures were determined through experimentally fitting of the N2 and OH molecular emission
bandswhile atomic excitation temperatureswere calculated using a Boltzmann distribution of He andMgatomic
lines. The rotational and excitation temperatureswere determined to be ~1000 K and ~2700 K respectively. Electron
number density was calculated to be on the order of ~3 × 1015 cm−3 utilizing Stark broadening effects of the
Hαline of the Balmer series and a He I transition. In addition, those diagnosticswere performed introducing magnesium(
by solution feed and laser ablation) into the plasma in order to determine any perturbation under heavy
matrix sampling. The so-called plasma robustness factor, derived bymonitoringMg II/MgI emission ratios, is also
employed as a reflection of potential perturbations in microplasma energetics across the various operation conditions
and sample loadings. While truly a miniaturized source (b1 mm3 volume), the LS-APGD is shown to be
quite robust with plasma characteristics and temperatures being unaffected upon introduction of metal species,
whether by liquid or laser ablation sample introduction.|
|URI : ||http://saber.ucv.ve/jspui/handle/123456789/9645|
|ISSN : ||0039-9140|
|Aparece en las colecciones: ||Artículos Publicados|
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