Patent ID: 8791410
Filing Date: 2014-07-29
Classification: H01J

Abstract:
1. A mass spectrometry system comprising: an ion source configured to generate a beam of ions having a negative charge state; a first mass analyzer configured to receive ions generated in said ion source and to transmit only ions having a mass-to-charge ratio corresponding to a first predetermined mass and a charge state of 1−; a stripper target configured to receive ions that have been transmitted by said first mass analyzer, the stripper target comprising a stripping gas to change the charge state of said ions from negative to positive charge and to dissociate molecular ions by collisions with said stripping gas, said stripping gas comprising at least one gas selected from helium and hydrogen gas; a second mass analyzer configured to receive ions that have exited the stripper target and to transmit ions having a mass-to-charge ratio corresponding to a second predetermined mass and a charge state of 1+; and a detector configured to detect ions in a charge state of 1+ that have been transmitted by the second mass analyzer, wherein the system is configured to inject said ions into said stripper target at a kinetic energy below 200 keV.