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Journal of the American Society for Mass Spectrometry

, Volume 13, Issue 9, pp 1099–1107 | Cite as

A secondary ion microprobe ion trap mass spectrometer

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Abstract

An ion trap mass analyzer has been attached to an organic secondary ion microprobe. A pressure differential >100 can be maintained between the ion trap and microprobe. The well-focused secondary ion beam can transit a small (2 mm) diameter tube, but gas flow from ion trap to microprobe is impeded. This pressure differential allows the microprobe to retain imaging capability. Ion trap and microprobe data systems are integrated by taking advantage of the highly reproducible periodicity of the ion trap operating in resonant ejection mode and asynchronous signal and data acquisition afforded by commercially available interface cards. Secondary ion mass spectra and images obtained indicate an approximately 10-fold improvement in sensitivity, although preliminary evidence indicates low (<1%) trapping efficiency. Image data acquisition using the ion trap for mass analysis requires at least 10 times as much time compared to using a quadrupole mass filter because the mass-selected instability mode is used for mass analysis, i.e., mass resolution in the ion trap is not continuous as it is in the quadrupole.

Keywords

Quadrupole Mass Filter Chemical Noise Resonance Ejection Secondary Ionization Mass Spectrometry Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© American Society for Mass Spectrometry 2002

Authors and Affiliations

  1. 1.Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeUSA

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