Patent ID: 8847157
Filing Date: 2014-09-30
Classification: H01J

Abstract:
1. An apparatus for analyzing chemical species comprising: (a) at least two vacuum stages, each of said vacuum stages having means for pumping away gas to produce a partial vacuum, (b) an ion source for producing ions and delivering said ions into a first of said vacuum stages, (c) at least one multipole ion guide comprising a plurality of parallel poles and an internal volume defined therein by said plurality of parallel poles, said at least one multipole ion guide being located in at least one of said vacuum stages, (d) a means for applying electrical voltages to said plurality of parallel poles of said at least one multipole ion guide, said electrical voltages having AC and DC components, (e) means for moving said ions into a at least one multipole ion guide, (f) electrode elements located at an entrance and exit ends of said at least one multipole ion guide, (g) means for applying electrical voltages to said electrode elements, (h) a Time-of-Flight mass analyzer and detector located in at least one of said vacuum stages, (i) a means for controlling said electrical voltages applied to said plurality of parallel poles of said at least one multipole ion guide and a means for controlling said electrical voltages applied to said electrode elements such that selected m/z values of said ions produced by said ion source are fragmented in said internal volume of said at least one multipole ion guide and at least a portion of said fragment ions are directed to said Time-of-Flight mass analyzer and detector for mass analysis.