Surface analysis of stratospheric dust particles

Details Surface analysis of stratospheric dust particles Surface analysis of stratospheric dust particles

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..637r&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 4, pp. 637-646 (1999).

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Scientific paper

A controversially discussed and yet central question in IDP research is the degree of alteration of these particles during their residence in the stratosphere. Especially the typical enrichment of Br in chondritic IDPs (on the average ~21 CI) has been inferred to be a result of contamination processes, probably invoking aerosol droplets. With time-of-flight secondary ion mass spectrometry (TOF-SIMS) we examined the very surfaces of 13 stratospheric particles from the dust collector U2071. Six particles had severe, surface-bound, silicone oil residues preventing a proper analysis of their surfaces. Six other particles ( according to our SEM-EDS studies pre-classified as one (Fe,Ni)S-rich IDP, one Ca-rich particle, and four aluminum oxide spheres ( carry the halogens F, Cl, and Br on the very surface. At least for the aluminum oxide spheres we provide unequivocal evidence for a surface correlation of halogens. Taken this evidence together with that from previous studies a general stratospheric contamination process is proven and must be considered in IDP research.

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