Method and apparatus for time-of-flight mass spectrometry
AssigneeJEOL Ltd.
InventorsTakaya Sato, Michisato Toyoda, Morio Ishihara
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Abstract
A method and apparatus for time-of-flight (TOF) mass spectrometry. The apparatus improves the ion focusing properties in an orthogonal direction and permits connection with an orthogonal-acceleration ion source for improvement of sensitivity. The apparatus comprises an ion source for emitting ions in a pulsed manner, an analyzer for realizing a helical trajectory, and a detector for detecting the ions. The analyzer is composed of plural laminated toroidal electric fields to realize the helical trajectory.
Claims9
A time-of-flight mass spectrometer comprising:
- an ion source capable of emitting plural ions in a pulsed manner;
- an analyzer for realizing a helical trajectory;
- and
- a detector for detecting ions;
- wherein the analyzer is composed of plural laminated toroidal electric fields to realize the helical trajectory.
A helical-trajectory time-of-flight mass spectrometer comprising:
- plural sets of laminated toroidal electric fields each consisting of plural layers of a cylindrical electrode and plural Matsuda plates to cause ions to travel in a helical trajectory, wherein
- 1) each of the Matsuda plates forming the laminated toroidal electric fields uses arcuate electrodes,
- 2) each of the arcuate electrodes is tilted about an axis of rotation that is defined by an intersection of a midway plane of the angle of rotation and a midway plane in the thickness direction, and
- 3) the position of a center trajectory of the ions is made different from a midway position of each Matsuda plate in a plane of radius of rotation of the center trajectory of the ions at an end surface of a cylindrical electric field.
Dependencies are inferred from the claim text.