Patent ID: 8373121
Filing Date: 2013-02-12
Classification: H01J

Abstract:
1. A magnetic mass spectrometer with double focusing comprising an ion source, an entry slit, an electrostatic section, a magnetic section and means for simultaneous detection of at least one ion mass, comprising: a first electrostatic device placed between the ion source and the exit of the electrostatic section, focusing the beam of ions onto the main axis of the mass spectrometer; a second electrostatic device disposed downstream of the magnetic section, creating in the longitudinal plane of symmetry a radial electric field that is higher the further the point in question is from the axis and whose respective signs, on the side of the low masses and on the side of the high masses, are opposing; wherein the electrostatic section is a truncated spherical electrostatic section comprising an external electrode to which a +Ve voltage is applied, and an internal electrode to which a −Ve voltage is applied, the external electrode and the internal electrode furthermore comprising a pair of external parallel plates disposed on either side of the external electrode and to which a voltage V the voltages V