Ion Trap With Spatially Extended Ion Trapping Region

摘要

A mass or mass to charge ratio selective ion trap is disclosed having an increased charge storage capacity. A RF voltage acts to confine ions in a first (y) direction within the ion trap. A DC voltage and/or an RF voltage acts to confine ions in a second (x) direction within the ion trap. A quadratic DC potential well acts to confine ions in a third (z) direction within the ion trap. Ions are excited in the third (z) direction and are caused to be mass or mass to charge ratio selectively ejected in the third (z) direction.

主权项

1. A mass or mass to charge ratio selective ion trap comprising:
a first device arranged and adapted to generate a radially asymmetric pseudo-potential barrier or well which acts to confine ions in a first (y) and a second (x) direction within said ion trap; a second device arranged and adapted to generate a substantially DC quadratic potential well which acts to confine ions in a third (z) direction within said ion trap; and a third device arranged and adapted to excite ions in said third (z) direction so as to mass or mass to charge ratio selectively eject ions in said third (z) direction.