Single-particle mass spectrometer

Details Single-particle mass spectrometer Single-particle mass spectrometer

2008-04-29

2008-04-29

Nguyen, Kiet T. (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S288000

Reexamination Certificate

active

11377364

ABSTRACT:
Disclosed is a single-particle mass spectrometer, which includes a chamber keeping an inside in a vacuum state by a vacuum pump, a cylindrical flying tube installed to communicate with the chamber, an aerodynamic lens installed to the chamber to focus aerosol particles input from outside, a laser generating means for irradiating a laser beam to the particles focused by the aerodynamic lens to emit ions, an extraction acceleration means for extracting the emitted ions and accelerating the ions to fly along the flying tube, and an ion detector installed to an end of the flying tube to detect the ions flying along the flying tube. The extraction acceleration means includes a reflector made of a conductive material with a semispherical shape and to which a relatively high voltage is applied; at least one mesh-shaped grid arranged from the reflector toward the ion detector at regular intervals, and to which a relatively low voltage is applied in comparison to the reflector; a cylindrical electrode; and an Einzel lens. Thus, the ions are biased due to a voltage difference between the reflector and the grid to fly toward the ion detector along the flying tube, and also refracted toward a central axis of the flying tube by means of the cylindrical electrode and the Einzel lens.

REFERENCES:
patent: 5300774 (1994-04-01), Buttrill, Jr.
patent: 5629518 (1997-05-01), Grotheer et al.
patent: 7087897 (2006-08-01), Bateman et al.

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