Radiant energy – Ion generation – Field ionization type
Patent
1979-08-24
1981-12-01
Dixon, H.
Radiant energy
Ion generation
Field ionization type
250288, 250396R, 250294, H01J 2700
Patent
active
043038654
ABSTRACT:
A plasma discharge ion source for a mass spectrometer, having a magnet forming an axial magnetic field, two cathodes axially spaced in said field and an annular anode between the cathodes. Ions generated by the source emerge via an opening in one cathode and then pass in succession through axially aligned openings in two planar electrodes. The electrode closest said one cathode has a further disc or cone shaped electrode positioned in the opening of that electrode so as to form an annular gap between the peripheries of the disc shaped electrode and opening.
Ions from the source opening pass in succession through the annular gap and then through the electrode opening in the electrode furtherest from the source opening. By applying suitable electric potentials to the electrodes ions of an energy above a predetermined level are prevented from passing through the electrodes.
A mass spectrometer employing the source is also disclosed this employing an electrostatic ion filter and an ion collector to receive filtered ions from the source via the filter.
The collector includes a slow ion deflector arranged to deflect emergent ions from the filter to a collector member of the collector and to which deflector emergent ions of high energy travel directly without such deflection.
REFERENCES:
patent: 3100260 (1963-08-01), Wilska
patent: 3835319 (1974-09-01), Roehrig et al.
patent: 4189640 (1980-02-01), Dawson
Commonwealth Scientific & Industrial Research Organization
Dixon H.
LandOfFree
Cold cathode ion source does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cold cathode ion source, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cold cathode ion source will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1298611