FOUR-ELECTRODE KINGDON TRAP WITH EQUISPACED ELECTRODES Russian patent published in 2023 - IPC H01J49/42 

FIELD: mass spectrometry.

SUBSTANCE: mass spectrometer with electron impact ionization based on a multi-electrode harmonized Kingdon trap. The mass spectrometer is equipped with at least one source of electrons located outside the Kingdon trap, ionizing molecules of the analyte gas inside the trap, located under a negative potential U, sufficient to accelerate the electrons and their penetration into the trap, and configured to ionize the molecules of the analyte gas with electrons, the energy value varies from U in the region near the external electrodes to zero - at the electron turning point, where the potential of the trap field created by the internal electrodes coincides with the potential applied to the electron source.

EFFECT: increase in the reliability of the device and the operating time without replacing the cathode by doubling the working volume of the trap, lowering the coalescence threshold and doubling the independent sources of electrons.

4 cl, 8 dwg