The invention relates to an
ion dissociation device, a control method and a
mass spectrometer. The
ion dissociation device comprises an inlet
electrode, a first transmission
electrode, a first grid mesh, a
magnet, an
electron source, a second grid mesh and an outlet
electrode which are sequentially arranged, the inlet electrode and the outlet electrode are respectively provided with a first hole and a second hole for ions to be output to pass through; a reaction space is defined by the
magnet, the first grid mesh and the second grid mesh, and the
electron source extends into the reaction space; a containing space is defined by the inlet electrode, the first transmission electrode and the first grid mesh, and the
voltage of the inlet electrode, the
voltage of the first transmission electrode, the
voltage of the first grid mesh, the voltage of the
magnet and the voltage of the second grid mesh are independently adjustable. Through the arrangement,
ion storage and accumulation are carried out while ion reaction is carried out, the ion
utilization rate is improved, and the path of subsequent ions entering the reaction space is shortened, so that the ion response speed is improved, long-time
trapping can be realized, and ion loss is reduced.