METHOD OF CONTINUOUS STABLE ELECTRIC SPRAYING OF SOLUTIONS IN SOURCE OF IONS AT ATMOSPHERIC PRESSURE Russian patent published in 2017 - IPC H01J49/26 G01N30/72 

FIELD: electrical engineering.

SUBSTANCE: invention relates to mass-spectrometry. Method enables obtaining a continuous stable flow of charged particles by electric spraying for high volumetric speeds of analyzed substances solutions, without formation of large drops at the beginning of a new sample electric spraying, which substantially simplifies the process of obtaining a continuous and stable mono-dispersed flow of charged particles in wide range of sprayed liquid volumetric flow rates and respectively stable ion current of the analyzed substances coming into the analyzer, as well as long-term operation of the source without disassembling and cleaning. Method features are adding the liquid sample into the area of spraying without interrupting the eluent flow and drying the pumped off the gas-vapour mixture of excess not sprayed eluent and gas. Mode of continuous stable emission of charged particles (ion current) is implemented for an arbitrary long time only provided that each fed into the spraying area sample does not cause hydraulic fracturing of the liquid flow. Besides, the continuous stable mode of emission of charged particles is affected by a long-term stable pumping off the gas-vapour mixture from the area of spraying, which is quite easily achieved by drying the gas-vapour mixture from the eluent. Herewith the adjustable parameter of spraying is the value of electric voltage supplied to the counter electrode, and the flow of withdrawn gas from the coaxial channel between capillaries after setting the stable mode does not change during all time of operation of the ion source at continuous supply of the liquid sample into the area of electric spraying.

EFFECT: technical result is enabling production of continuous long-term stable current of charged particles by electric spraying in a wide range of volumetric speeds of analyzed substances solutions under normal conditions with successive introduction of a sample into the area of spraying and respectively stable ion current of the analyzed substances coming into the analyzer.

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