METHOD OF SEPARATING IONS OF ORGANIC AND BIOORGANIC COMPOUNDS IN ION ROTATION-AVERAGED ELECTRIC FIELD OF SECTIONED CYLINDRICAL CELL Russian patent published in 2013 - IPC H01J49/00 

FIELD: chemistry.

SUBSTANCE: basis of the invention is separation of ions from external source according to the mass-to-charge ratio (m/z) in a mass spectrometer with an orbital ion trap without a centre electrode, where a longitudinal ion rotation-averaged electric field which is close to harmonic is formed by applying suitable potential across sections of the surface of the trap. Rotation of the analysed ions is excited when these ions are fed into the cell along its axis by a rotating electric field. Loss of ions on the wall of the cell is prevented by applying an effective potential which arises when ions pass near the surface with alternative potential on its sections. Detection of induced signals from oscillating ions is carried out when the rotating field is turned off, and processing of said signals for relatively wide ranges of m/z is carried out based on fast Fourier transformation. For the selected intervals of m/z, the registered data are approximated with exponentially damped sinusoidal curves whose frequencies characterise m/z of ions, and indices of the damped exponential characterise the average frequency of collision of the analysed ions with atoms and molecules of residual gases. Axial input of ions into the cell enables their accumulation, dissociation, energy analysis and separation according to mass, charge and mobility.

EFFECT: efficiency accumulation, separation and detection of ions.

12 cl, 5 dwg