RESONANCE EJECTION ION-TRAP MASS-SPECTROMETRY AND NONLINEAR FIELD CONTRIBUTIONS - THE EFFECT OF SCAN DIRECTION ON MASS RESOLUTION

被引：80

作者：

WILLIAMS, JD ^{[1
]}

COX, KA ^{[1
]}

COOKS, RG ^{[1
]}

MCLUCKEY, SA ^{[1
]}

HART, KJ ^{[1
]}

GOERINGER, DE ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831

来源：

ANALYTICAL CHEMISTRY | 1994年 / 66卷 / 05期

关键词：

D O I：

10.1021/ac00077a023

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Mass resolution obtained with the commonly employed stretched quadrupole ion trap geometry is shown to be dependent upon scan direction when resonance ejection is used as the mass analysis method. Data are also presented showing that the energy absorption profile for ions subjected to resonance excitation broadens with the amplitude of ion oscillation and shifts to higher frequencies, an observation consistent with behavior predicted for ion motion in a quadrupole electric field with relatively small higher-order field components. The observed effect of scan direction on mass resolution is therefore reasoned to arise from an effect analogous to Doppler focusing or defocusing, depending on scan direction relative to the direction of the ion frequency shift with oscillatory amplitude.

引用

页码：725 / 729

页数：5

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