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Patent Searching and Data

Document Type and Number:
Japanese Patent JP2005528745
Kind Code:
The invention solves the problem of artifact ghost peaks which can sometimes arise in mass spectrometers that employ a quadrupole rod set for both trapping and mass analyzing the trapped ions. The problem arises as a result of randomly distributed voltage gradients along the length of the rods. Three solutions are presented. The first approach involves improving the conduction characteristics of the rod sets. The second approach involves the application of at least one continuous axial DC field to the trapping quadrupole rod set in order to urge ions towards a pre-determined region of the trap, thereby avoiding voltage gradients. The third approach involves the application of one or more discrete axial fields to create one or more potential barriers along the axial dimension of the trap (in addition to the barriers used to initially trap the ions). These barriers prevent ions of differing voltage gradients from equilibrating with one another.

Application Number:
Publication Date:
September 22, 2005
Filing Date:
May 29, 2003
Export Citation:
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MDS INC., doing business as MDS SCIEX
International Classes:
G01N27/62; H01J49/42; (IPC1-7): H01J49/42; G01N27/62
Attorney, Agent or Firm:
浅村 皓
浅村 肇
清水 邦明
林 鉐三