Can Surface Induced Dissociation (SID) help untangle the issues associated with the Cassini INMS measurement of organic molecules in Enceladus' plume?

Details Can Surface Induced Dissociation (SID) help untangle the issues associated with the Cassini INMS measurement of organic molecules in Enceladus' plume? Can Surface Induced Dissociation (SID) help untangle the issues associated with the Cassini INMS measurement of organic molecules in Enceladus' plume?

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p23c..08w&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P23C-08

Physics

[0328] Atmospheric Composition And Structure / Exosphere, [5430] Planetary Sciences: Solid Surface Planets / Interiors, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites

Scientific paper

The Cassini INMS gas composition measurements for all Enceladus flybys (where pointing permits) have indicated organic content ranging from methane (~0.2 mole fraction) to benzene (~10-5 mole fraction). However, the organics mole fraction appears to vary with the velocity of the spacecraft relative to the plume gas. Lower speeds have less organic content by a factor of 3 to 10 relative to the fast flybys. This suggests that molecular dissociation may play a role in determining what is measured by INMS. Surface Induced Dissociation (SID) is a technique that has been used in tandem mass spectrometry to uniquely determine the composition and structure of complex organics such as peptide fragments. A vast body of information gathered as a result of SID experiments has been published that may be brought to bear on how heavy organics dissociate upon impact with metal surfaces. We apply this information to the problem of interpreting the INMS data at Enceladus.

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