公开(公告)号：US20180240663A1

公开(公告)日：2018-08-23

申请号：US15948028

申请日：2018-04-09

Applicant: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY

Inventor： Peter Williams ,  Karen Amanda Williams ,  Maitrayee Bose ,  John Prince

IPC: H01J49/14 ,  H01J49/26

Abstract: A primary ion source subassembly for use with a secondary ion mass spectrometer may include a unitary graphite ionizer tube and reservoir base. A primary ion source may include a capillary insert defining an ionizer aperture. An ionizer aperture may be centrally arranged in an outwardly protruding conical or frustoconical surface, and may be overlaid with a refractory metal coating or sheath. Parameters including ionizer surface shape, ionizer materials, ionizer temperature, and beam stop plate orifice geometry may be manipulated to eliminate ghost images. A graphite tube gasket with a dual tapered surface, or an externally threaded graphite tubular connecting body, may promote sealing of a source material cavity.

公开(公告)号：US10672602B2

公开(公告)日：2020-06-02

申请号：US15948028

申请日：2018-04-09

Applicant: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY

Inventor： Peter Williams ,  Karen Amanda Williams ,  Maitrayee Bose ,  John Prince

IPC: H01J49/14 ,  H01J49/26 ,  H01J27/26

Abstract: A primary ion source subassembly for use with a secondary ion mass spectrometer may include a unitary graphite ionizer tube and reservoir base. A primary ion source may include a capillary insert defining an ionizer aperture. An ionizer aperture may be centrally arranged in an outwardly protruding conical or frustoconical surface, and may be overlaid with a refractory metal coating or sheath. Parameters including ionizer surface shape, ionizer materials, ionizer temperature, and beam stop plate orifice geometry may be manipulated to eliminate ghost images. A graphite tube gasket with a dual tapered surface, or an externally threaded graphite tubular connecting body, may promote sealing of a source material cavity.