Sequencing ion packets for ion time-of-flight mass spectrometry

Details Sequencing ion packets for ion time-of-flight mass spectrometry Sequencing ion packets for ion time-of-flight mass spectrometry

1993-12-21

1995-03-07

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

250282, H01J 4940

Patent

active

053960653

ABSTRACT:
A method and apparatus for analyzing ions by determining times of flight include establishing an encoded sequence for launching packets of ions from a source region toward a detector. The encoded sequence is one in which the high-mass ions of a leading packet will be passed by the low-mass ions of a trailing packet. Thus, a high efficiency time-of-flight mass spectrometer is formed. The ions of each packet are acted upon to bunch the ions of the packet, thereby compensating for initial space and/or velocity distributions of ions in the launching of the packet. The times of arrival of the ions are determined at the detector to obtain a signal of overlapping spectra corresponding to the overlapping launched packets. A correlation between the overlapping spectra and the encoded launch sequence is employed to derive a single non-overlapped spectrum.

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