Document Detail


Central ring electrode for trapping and excitation/detection in Fourier transform ion cyclotron resonance mass spectrometry.
MedLine Citation:
PMID:  11142358     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The use of a central trapping ring electrode for Fourier transform ion cyclotron resonance (FTICR) mass spectrometry is demonstrated. Ions are trapped with an oppositely biased static potential superimposed on both the excite and detect electrodes and maintained throughout the experiment, including the application of a dipolar rf excite waveform and the image current ion detection event. The use of a central trapping electrode for FTICR coupled with an open cell design retains the advantages of high ion throughput and gas conductance, while simplifying the electrode geometry and reducing the overall dimensions of the cell. This allows the central trapping electrode to be of utility in volume-limited vacuum chambers including FTICR instrument miniaturization. Presented here are the preliminary experimental results using the central trapping electrode as an FTICR cell in which the excitation and detection electrodes also create a trapping depression to constrain the z-axis motion of the ions. The cell overcomes the principle limitation of an earlier single trapping electrode design by producing a 91% effective potential well depth compared to 19% for the single trapping electrode and 33% for standard open cells. This allows the central trapping electrode configuration to achieve an order of magnitude improvement in ion capacity compared to more conventional open cell designs.
Authors:
C M Ostrander; C R Arkin; D Laude
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the American Society for Mass Spectrometry     Volume:  12     ISSN:  1044-0305     ISO Abbreviation:  J. Am. Soc. Mass Spectrom.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-01-04     Completed Date:  2001-02-22     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  9010412     Medline TA:  J Am Soc Mass Spectrom     Country:  United States    
Other Details:
Languages:  eng     Pagination:  30-7     Citation Subset:  -    
Affiliation:
Department of Chemistry and Biochemistry, The University of Texas at Austin, 78712, USA.
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