Linear ion trap

Details Linear ion trap Linear ion trap

H - Electricity

01

J

H01J 49/42 (2006.01)

Patent

CA 2711898

A linear ion trap (6,7,8) is disclosed comprising a central quadrupole rod set (6) and a post-filter quadrupole rod set (8). A 180° phase difference is maintained between axially adjacent rod electrodes of the central quadrupole rod set (6) and the post-filter quadrupole (8) so that an axial pseudo-potential barrier is created between the central quadrupole rod set (6) and the post-filter quadrupole (8). A supplementary AC voltage is applied to the rods of the central quadrupole (6) in order to radially excite ions which are desired to be ejected from the ion trap. The ions are ejected from the ion trap (6,7,8) non-adiabatically in an axial direction.

L'invention porte sur un piège à ions linéaire (6, 7, 8) comprenant un ensemble barre quadrupolaire central (6) et un ensemble barre quadrupolaire post-filtre (8). Une différence de phase de 180° est maintenue entre des électrodes de barre axialement adjacentes de l'ensemble barre quadrupolaire central (6) et du quadrupôle post-filtre (8) de sorte qu'une pseudo-barrière de potentiel axiale est créée entre l'ensemble barre quadrupolaire central (6) et le quadrupôle post-filtre (8). Une tension alternative supplémentaire est appliquée aux barres du quadrupôle central (6) de façon à exciter radialement des ions dont on souhaite qu'ils soient éjectés du piège à ions. Les ions sont éjectés du piège à ions (6, 7, 8) de façon non adiabatique dans une direction axiale.

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