BLACK CANYONS FOR IONS STORED IN AN ION-TRAP MASS-SPECTROMETER

被引：22

作者：

EADES, DM ^{[1
]}

YOST, RA ^{[1
]}

机构：

[1] UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611

来源：

RAPID COMMUNICATIONS IN MASS SPECTROMETRY | 1992年 / 6卷 / 09期

关键词：

D O I：

10.1002/rcm.1290060908

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

Effects from higher order non-linear resonances, 'black canyons', have been observed for ions stored within the quadrupole ion-trap mass spectrometer. At specific q(z) values, higher-order field effects were observed to cause decreased intensity of chemical ionization (CI) reagent ions, due to inefficient storage, as well as collision-induced dissociation. Effects have been observed, whether or not the CI reagent ions are mass-selected, and exhibit increased severity with longer storage times. Previous reports have shown 'black holes' due to inefficient storage of product ions in tandem (MS/MS) spectra, but have reported no such effects in normal mass spectra. Without employing resonant excitation, higher-order field effects were investigated and found to occur continuously along iso-beta(z) lines for beta(z)= 113, 1/2, and 2/3. Described in this paper are the direct effects from higher-order fields on ions stored at specific q(z) values, and indirect effects caused by those ions. Also described in this paper is new evidence for 'black canyons' occurring at beta(z) = 1/3 at negative a(z) values.

引用

页码：573 / 578

页数：6

共 13 条

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