Panoramic ion detector for mass spectrograph - with spatially separated ion beams converted into corresponding electron beams

摘要

The panoramic ion detector is used in a mass spectrograph with spatial separation of the different types of ions. It has an input diaphgragm (1) for the ions exhibiting planar symmetry coupled to earth potential and with a central opening for passage of the ion beam (2). This is followed by an electrode (5) for converting the ions into electrons, with the same place of symmetry as the diaphragm (1) and coupled to a negative voltage source (-V). This electrode (5) faces an electrode plate (9) coupled to a positive voltage source (+V). The surface of the conversion electrode (5) facing towards the electrode plate (9) is formed so that the output electron beams have the same spatial distribution as that of the ion beams. The ion detector is used in a mass spectrograph to allow a continuous spatial resolution. It may be used in conjunction with a photomultiplier.