Time of flight mass spectrometer using an ion reflector

Details Time of flight mass spectrometer using an ion reflector Time of flight mass spectrometer using an ion reflector

1986-06-18

1988-03-15

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

250286, B01D 5944

Patent

active

047315326

ABSTRACT:
The ion reflector of the time of flight mass spectrometer comprises between the decelerating electrodes (27, 28) defining the decelerating field and the reflector electrode (29) an additional focusing electrode (30). Just as the focusing electrode (30), the deceleration electrodes (28, 28) are also preferably designed as grid-less diaphragm rings. Further, the front decelerating electrode arranged at the input of the ion reflector has preferably a larger aperture diameter than the rear decelerating electrode (28). The arrangement of the decelerating and focusing electrodes and the potentials applied to them are selected to ensure that an inhomogenous electric field is generated in the area of these electrodes which has the effect of a lens and which in conjunction with the following homogenous field which extends to the reflector electrode (29) ensures not only focusing in time, but also perfect geometrical focusing of the ion beam upon the detector.

REFERENCES:
patent: 3727047 (1973-04-01), Janes
patent: 4072862 (1978-02-01), Mamyrin et al.
patent: 4295046 (1981-10-01), Grutter et al.
patent: 4611118 (1986-09-01), Managadze
patent: 4625112 (1986-11-01), Yoshida
Soviet Physics-Technical Physics, vol. 16, No. 7, 1972, pp. 1177-1179, Karataev et al., "New Method for Focusing Ion Buneches in Time-of-Flight Mass Spectrometers".
International Journal of Mass Spectrometry and Ion Physics, 46, 1983, pp. 63-66, C. Berger, "Compensator Role of the Electrostatic Mirror in Time of Flight Mass Spectrometry".

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