期刊
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
卷 21, 期 2, 页码 203-208出版社
AMER CHEMICAL SOC
DOI: 10.1016/j.jasms.2009.10.001
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资金
- PIRE
- National Science Foundation Office of International Science and Engineering [OISE-730072]
It has been previously observed that the measured frequency of ions in a Fourier transform mass spectrometry experiment depend upon the number of trapped ions, even for populations consisting exclusively of a single mass-to-charge. Since ions of the same mass-to-charge are thought not to exert a space-charge effect among themselves, the experimental observation of such frequency shifts raises questions about their origin. To determine the Source Of Such experimentally observed frequency shifts, multiparticle ion trajectory simulations have been conducted on monoisotopic populations of Cs+ ranging from 10(2) ions to 10(6) ions. A close match to experimental behavior is observed. By probing the effect of ion number and orbital radius On the shift in the cyclotron frequency, it is shown that for a monoisotopic population of ions, the frequency shift is caused by the interaction of ions with their image-charge. The addition of ions of a second mass-to-charge to the Simulation allows the comparison of the magnitude of the frequency shift resulting from space-charge (ion-ion) effects vel-SUS ion interactions with their image charge. (J Am Soc Mass Spectrom 2010, 21, 203-208) (C) 2010 Published by Elsevier Inc. on behalf of American Society for Mass Spectrometry
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