Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.494m&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 494-495
Other
2
Antarctic Regions, Chondrites, Density Measurement, Meteoritic Composition, Micrometeorites, Energy Dissipation, Ion Microscopes, Particle Mass, Volatility
Scientific paper
In contributing to a complete Interplanetary Dust Particle (IDP) chemical dataset we measured the bulk chemistry of six chondritic IDPs from collector L2005 with the new Heidelberg micron-Proton Induced X Ray Emission (PIXE). The results are given normalized to Fe and CI. While particles B11, C18, C34, and C35 were measured intact, B12 and E28 fragmented during preparation. The two respectively three fragments, analyzed individually, indicate rather homogeneous composition of the two IDPs. Only Br (and Zn) is more enriched in one E28 fragment than in the other two. Three IDPs have normal Ca, while the three others are depleted. Generally, volatile elements are enriched, up to 853 x CI Br in C34. There is widespread Ga and Zn but especially the spherical B11 is not depleted in Zn. With the new micron-PIXE we now obtain element profiles with a resolution of 1 micron in scanning direction for all elements from Mg to Br. The resulting element ratio variations are present (normalized to bulk) across the horizontal and vertical midplanes of IDP B11. All elements are distributed rather homogeneously with the exception of S. Cl and K as well as Co and Ni (and Zn) respectively have similar distribution patterns. The densities of IDPs are largely unknown although density is a fundamental physical parameter. We installed Scanning Transmission Ion Microscopy (STIM) for density measurements of micrometer-sized specimens. From the observed proton energy loss the area density is calculated with a lateral resolution of 1 micron. By integration over the scanning area we measure the mass of the particle of which the surface profile and volume are acquired by interference microscopy. As a test we analyzed IDP B11 and obtained a mass of 11 ng and a mean density of 2.3 g/cu cm with an accuracy of 15%.
Arndt Peter
Bohsung Joerg
Jessberger Elmar K.
Maetz Mischa
Traxel Kurt
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