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The shadow imaging of gas and plasma flow in an inductively coupled plasma optical emission spectrometer

Abstract

The shadow imaging of gas and plasma flow in an inductively coupled plasma optical emission spectrometer

Nagulin K.Yu.

Incoming article date: 24.06.2016

Dynamics of gas and plasma flow in a Fassel type torch for the OPTIMA 2000 optical emission spectrometer (PerkinElmer, USA) was investigated using the original shadow Toepler visualizer. Significant transient instability of plasma’s flow was registered by the high-speed shadow imaging. Observable structure of the plasma torch was described and interpreted. The process of formation of toroidal vortices within the plasma torch was demonstrated, its frequency was estimated. Effect of reverse gas flow back to the plasma torch is revealed, interpreted and experimentally validated. It is noted that ambient air containing residues of the analyzed substances getting into a spectrally pure analytical zone of the plasma torch can lead to deterioration of metrological characteristics of a spectrometer because of “memory effect”. A set of practical recommendations to protect the analytical zone of the plasma torch from the contamination caused by the gas backflow of surrounding gas was formulated.

Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production