ELECTROMEMBRANE ION SOURCE AND METHOD FOR ITS MANUFACTURE Russian patent published in 2022 - IPC H01J49/10 H01J9/02 

FIELD: analytical instrumentation.

SUBSTANCE: invention relates to the field of analytical instrumentation and can be used for mass spectral analysis of the composition of polar solutions at atmospheric pressure. An electromembrane ion source (EMIS) for transporting ions from a polar liquid into a vacuum includes a dielectric membrane separating the atmospheric and vacuum parts of the EMIS and a system of two electrodes that create a pulsed electric field for extracting ions from a solution into a vacuum. The membrane is hermetically fixed on a removable disk with a hole in the middle, made of a dielectric material, which ensures the absence of electrical contact between the atmospheric and vacuum surfaces of the membrane and the possibility of a quick replacement of the membrane. One of the two electrodes that create a pulsed electric field is placed in the analyzed solution located on the atmospheric side of the membrane. The extracting electrode is deposited on the vacuum side of the membrane and has a variable thickness, and the thickness of the extracting electrode sharply decreases when approaching the channels of the membrane, leaving an annular surface around the channels that is not covered with metal. EMIS contains a flow system for supplying the analyzed solution, mounted on the atmospheric side of the membrane, which ensures a continuous flow of the solution along the atmospheric surface of the membrane and filling the membrane channels with the solution. In the vacuum part of the EMII, the decelerating and accelerating grid electrodes are placed.

EFFECT: reducing the voltage to create a strong electric field that extracts ions from the solution, eliminating the generation of foreign ions on the membrane surface, the ability to control the energy of ions leaving the EMIS in the MS analyzer.

5 cl, 4 dwg