Figure 4
Meteorite polished section. (a) Fast survey fluorescence image of a 5.1 mm × 2.6 mm area, measured using a 10 µm × 5 µm beam, 9 µm pixels and 0.002 s per pixel (4.7 mm s−1 scan speed). Flux to the sample is ∼7 × 109 photons s−1 with an incident energy of 2700 eV. Red (P fluorescence) indicates Fe,Ni phosphide, green (S fluorescence) is Fe sulfide, blue (Si fluorescence) is olivine mineral grains and black is Fe,Ni metal. (b) Fine features in marked area using ∼2 µm beam and 1.56 µm pixels. At this scale, this sample's poor surface polish is evident at boundaries. (c) Phosphorus K-edge XANES of spot in (b) with ∼2 µm beam, a sum of eight scans of 45 s each; flux is ∼9 × 108 photons s−1. |