Ion trap with spatially extended ion trapping region
AssigneeMicromass UK Limited
InventorsKevin Giles, Martin Raymond Green, Daniel James Kenny, David J. Langridge, Jason Lee Wildgoose
Life of this patent
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Abstract
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.
Claims39
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.
A mass or mass to charge ratio selective ion trap comprising:
- a first device arranged and adapted to generate a pseudo-potential barrier or well which acts to confine ions in a first (y) direction and a DC potential barrier or well which acts to confine ions in 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.
A mass or mass to charge ratio selective ion trap having a substantially toroidal ion trapping region, said ion trap comprising:
- a first device arranged and adapted to generate a pseudo-potential barrier or well which acts to confine ions in a first (y) direction within said ion trap;
- a second device arranged and adapted to generate a substantially DC quadratic well which acts to confine ions radially within said ion trap;
- and
- a third device arranged and adapted to excite ions in a radial (r) direction so as to mass or mass to charge ratio selectively eject ions in said radial (r) direction.
A method of mass or mass to charge ratio selective ejection of ions from an ion trap comprising:
- generating 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;
- generating a substantially DC quadratic potential well which acts to confine ions in a third (z) direction within said ion trap;
- and
- exciting ions in said third (z) direction so as to mass or mass to charge ratio selectively eject ions in said third (z) direction.
A method of mass or mass to charge ratio selective ejection of ions from an ion trap comprising:
- generating a pseudo-potential barrier or well which acts to confine ions in a first (y) direction and a DC potential barrier or well which acts to confine ions in a second (x) direction within said ion trap;
- generating a substantially DC quadratic potential well which acts to confine ions in a third (z) direction within said ion trap;
- and
- exciting ions in said third (z) direction so as to mass or mass to charge ratio selectively eject ions from said ion trap in said third (z) direction.
A method of mass or mass to charge ratio selective ejection of ions from an ion trap having a substantially toroidal ion trapping region, comprising:
- generating a pseudo-potential barrier or well which acts to confine ions in a first (y) direction within said ion trap;
- generating a substantially DC quadratic well which acts to confine ions radially (r) within said ion trap;
- and
- exciting ions in a radial (r) direction so that ions are mass or mass to charge ratio selectively ejected in said radial (r) direction.
Dependencies are inferred from the claim text.