Testing of mass filtered, time dilated, time-of-flight mass spectrometry
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The Naval Research Laboratory’s Trace Element AMS system’s use of a Pretzel magnet as a recombinator and mass filter offers a unique opportunity to study a new type of time-of-flight (TOF) spectrometry. Mass filtering prior to TOF analysis removes extraneous species, shortening the analysis time for a single beam pulse, thereby improving the duty cycle. Time dilation results from a longer flight path for a heavier mass in the Pretzel magnet. Computer TOF simulations of these factors and the resulting impact on mass resolution for high mass atomic and molecular species are discussed. Initial measurements of carbon and silicon to confirm the validity of the model are presented.
KeywordsSecondary ion mass spectrometry Accelerator mass spectrometry Time-of-flight Mass resolution Duty cycle Actinide analysis
This work was supported by the Office of Naval Research and by the Defense Threat Reduction Agency through its Basic Research for Combating Weapons of Mass Destruction Program. The NRL-TEAMS facility is maintained through the work of Dr. C. Cetina, Mr. C. Kennedy, Mr. V. Cestone, and Mr. B. Renfro.
- 3.Knies DL, Grabowski KS, Hubler GK, Treacy DJ, Deturck TM, Enge HA (1997) In Dungan JL, Morgan IL (eds) Applications of accelerators in research and industry conference proceedings. American Institute of Physics Press, New York, p 783Google Scholar
- 7.Manura DJ, Dahl DA (2007) SIMION version 8.0 user manual. Scientific Instrument Services, USAGoogle Scholar
- 8.Wilson RG, Stevie FA, Magee CW (1989) Secondary ion mass spectrometry, a practical handbook for depth profiling and bulk impurity analysis. Wiley, New York, p 1.8-1Google Scholar