Coaxial ion guide

摘要

A method of mass and/or ion mobility spectrometry is disclosed comprising: trapping ions in an annular or co-axial ion trap; and then axially ejecting at least some of said ions from said annular or co-axial ion trap into an annular ion guide. Ions trapped in the ion trap are distributed around the entire circumference of the annular or co-axial ion trap. As the ions travel along at least a portion of the length of the ion guide their motion around the circumference of the annular ion guide is unrestricted and the ions separate axially as they travel along the ion guide.

主权项

1. A method of mass or ion mobility spectrometry comprising:
trapping ions in an annular or co-axial ion trap to establish trapped ions, wherein the trapped ions are distributed around the entire circumference of the annular or co-axial ion trap; and then axially ejecting at least some of said trapped ions, to establish ejected ions, from said annular or co-axial ion trap into an annular ion guide, wherein the ejected ions separate axially as the ejected ions travel along the ion guide, and wherein as the ejected ions travel along at least a portion of the length of the ion guide a motion of the ejected ions around the circumference of the annular ion guide is unrestricted; and then converting the ejected ions from an ion beam having an annular shaped cross section to an ion beam having a non-annular shaped cross-section.