Open AccessField-modulated selective ion storage in a quadrupole ion trap
Author(s) -
Greg Wellscor,
Chuck Huston
Publication year - 1995
Publication title -
journal of the american society for mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.961
H-Index - 127
eISSN - 1879-1123
pISSN - 1044-0305
DOI - 10.1016/1044-0305(95)00473-q
Subject(s) - chemistry , ion , ion trap , quadrupole ion trap , trapping , ion trapping , quadrupole , waveform , atomic physics , excitation , amplitude , dissociation (chemistry) , analytical chemistry (journal) , optics , physics , voltage , ecology , organic chemistry , quantum mechanics , chromatography , biology
A new method of selective ion storage in a quadrupole ion trap is described. Broadband waveforms were applied to the endcaps of an ion trap to eject unwanted ions by resonance excitation, which enhanced the storage of selected target ions. A unique trapping field amplitude modulation technique allowed the use of waveforms with fewer frequency components. The requirements and methods of calculations for frequency-optimized wave-forms are discussed. Advantages of this method include the reduction of target ion loss that results from collision-activated dissociation. In other applications, equivalent performance, relative to methods that use nonmodulated trapping fields combined with waveforms that have a higher frequency density, was shown.