A detailed investigation of the effects of molecules and defocusing in the high resolution mass spectrogram of Cassini Plasma Suites Ion Mass Spectrometer (CAPS IMS)

Details A detailed investigation of the effects of molecules and defocusing in the high resolution mass spectrogram of Cassini Plasma Suites Ion Mass Spectrometer (CAPS IMS) A detailed investigation of the effects of molecules and defocusing in the high resolution mass spectrogram of Cassini Plasma Suites Ion Mass Spectrometer (CAPS IMS)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm23a1905s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM23A-1905

Physics

[2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

CAPS IMS was designed to generate both a low and high resolution time of flight (TOF) mass spectra, with the low resolution spectra having a better count rate then the high resolution. The high resolution spectra is made possible by using a liner electric field (LEF) within the spectrometer to reflect those ions that retain a positive charge after passing through the carbon foils which generate the start signal. Because the LEF causes the ions to react like a mass on a spring the TOF of one cycle can be largely independent of energy. However in order to distinguish between atoms which come from molecules from those which are atomic in nature, the LEF was purposely defocused by making the electric field slightly stronger by the entrance to the TOF region then the far end. This causes low energy particles of any given species to have a shorter TOF than higher energy particles. By re-examining the original flight calibration data and analysis of additional data taken recently with the prototype model we are able to define the response of the IMS LEF to molecular species. This will allows us to develop our understanding of how to use the LEF spectra to determine relative abundances of molecular species such as O, OH, H2O and H3O within the magnetosphere of Saturn.

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