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Stardust run March 2006

Detailed analysis of particles in tracks 9 and 10 with X-ray spectroscopy, XRD, and elemental mapping to identify FeNiZn and related compounds.

thomasperry
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Stardust run March 2006

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  1. Stardust run March 2006 started 10pm 7mar06 mounted C2044,9 in 10.3.2 holder found beam using CsI(Tl) on side of holder track 9 coarse scan 0 to find top edge of keystone in total channel -- aborted to recenter track 9 coarse scan 1 recentered scan region on track Fe glitch cal: Glitch at 7263.74--> Fe edge at 7110.75. Zn glitch cal: Glitch at 9787.28 ---> Zn edge at 9660.76 1 FeNiZn 2 3 10mm pixel, 16px high 3mm pixel, 14px across

  2. FeNiZn 1 1 FeNiZn 3 FeNi 2 3 conclusions track 9 contains three particles Fe-XANES textbook match to pyrrhotite Zn-XANES in (1) textbook match to sphalerite XRD on (1) possible match to sphalerite+pyrrhotite (2 peaks) XRD on (2) good match to pyrrhotite (2 peaks) XRD on (3) possible match to pyrrhotite (2 peaks) track 10 contains multiple particles and a large t.p. analyzed 6 particles (1-4, t.p. & spot X) t.p. ? XANES is good match to Fe0(XRD? XRF?) spot X: need track 10 map with tp & spot X track 4 : analyzed 3 particles -- one in track and two terminal particles 3 1 2

  3. C2044 track 9 spots 1,2,3 Fe XANES Spot1 Spot2 Spot3 Pyrrhotite_borch

  4. C2044 track 9 Zn XANES spot1 Spot1 Sphalerite

  5. C2044 track 9, Spot1 MCA 7keV On (*100) Off (*100) On-off

  6. C2044 track 9, Spot1 MCA 10keV On (*100) Off (*100) On-off

  7. C2044 track 9, Spot1 MCA 14keV On (*100) Off (*100) On-off

  8. C2044 track 9, Spot2 MCA 7keV On (*100) Off (*100) On-off

  9. C2044 track 9, Spot2 MCA 10keV On (*100) Off (*100) On-off

  10. C2044 track 9, Spot2 MCA 14keV On (*100) Off (*100) On-off

  11. C2044 track 9, Spot2 MCA 14keV On (*100) Off (*100) On-off

  12. C2044 track 9, Spot3 MCA 7keV On (*100) Off (*100) On-off

  13. C2044 track 9, Spot3 MCA 10keV On (*100) Off (*100) On-off

  14. C2044 track 9, carrot MCA 14keV On (*100) Off (*100) On-off

  15. C2044 track 9, Spot3 MCA 14keV On (*100) Off (*100) On-off

  16. C2044 track 10, Spot X MCA 14keV Off (*100) On (*100) On-off

  17. C2044 track 10, Spot 4 MCA 10keV Off On On-off

  18. C2044 track 10, Spot 4 MCA 7keV Off On On-off

  19. C2044 track 10, term part MCA 10keV Off (*100) On (*100) On-off SSRL saw Ca (~1/3 Cr) Where is it?? maybe accidental Ca hotspot at SSRL?

  20. C2044 track 10, term part MCA 17keV Off (*100) On (*100) On-off

  21. C2044 track 10, spot 1 MCA 7keV Off (*100) On (*100) On-off

  22. C2044 track 10, spot 1 MCA 10keV Off (*100) On (*100) On-off

  23. C2044 track 10, spot 3 MCA 10keV Off (*100) On (*100) On-off

  24. C2044 track 10, spot 3 MCA 7keV Off (*100) On (*100) On-off

  25. C2044 track 9 spot 3 mca 10 kev diff (difference between ON and OFF the spot) Fe Zoom Cr S Ni

  26. C2044 track 10, terminal particle 14 keV XRD x-axis =2pi/D (nm-1)

  27. Track 10 VLM picture

  28. Track 10 mouth FeNi FeNiCr 4 Spot3 Off (*100) On (*100) On-off FeNiZn 2 1 3

  29. Track 10 spot 1 Fe XANES Spot1 FO80 olivine Need I say more?

  30. Track 10 terminal particle Fe XANES Spot1 FO80 olivine Need I say more? term part Fe foil

  31. Suspect spots2,3 are mixtures of pyrrhotite + oxide(?) Track 10 Spot2 Spot3 Pyrrhotite ref

  32. track10 spot3 has Fe, Ni - Does Ni substitute for Fe? Take XANES at both edges, plot together Track 10 That odd offset figure is the difference in edge energies for elemental Ni, Fe, according to Kraft, et. al. The Fe, Ni environments are very different, showing that the elements are either in different phases or different sites in the same phase. Fe-edge Ni-edge (subtract 1220.74eV from energy) Ni cal: Edge found at 8330.9.; glitch found at 8314.7. Scan steps are 0.5eV for cal, 1eV for data

  33. Track 10 Particle 1 14keV 17keV

  34. Track 10 Particle 2 14keV 17keV

  35. Track 10 Particle 3 14keV 17keV

  36. Track10 terminal particle 14keV Particle 4 14keV

  37. 3 2 1 Fe Track 4: The one with Ga Mounted between polypropylene sheets track mouth track 4 coarse map Ni Please recalibrate XRD detector as it had to be moved back a bit. XRD has big bkd due to crystallinity of plastic in sample mount: did it and called it alumina track4

  38. Track 4 Spot1 - the Ga-containing spot On*100 Off*100 Diff Ti Ga

  39. Track 4 spot 1 @ 17 keV On Off Diff

  40. Track 4 terminal particle 2 @ 14 keV On Off Diff

  41. Track 4 spot 2 @ 7 keV On Off Diff

  42. Track 4 spot 2 @ 10 keV On Off Diff

  43. Track 4 spot 2 @ 17 keV On Off Diff

  44. Track 4 spot 3 @ 7 keV On Off Diff

  45. Track 4 spot 3 @ 10 keV On Off Diff

  46. Track 4 spot 3 @ 14 keV On Off Diff

  47. Track 4 spot 3 @ 17 keV On Off Diff

  48. FeNi Track 4: terminal particles at 10keV Mounted between polypropylene sheets NiFeZn NiFe 2 3 same with higher contrast Fine map at 10keV (10um pixel size) Fe

  49. Track 4: terminal particles at 10keV Mounted between polypropylene sheets Fe xanes on terminal particles (spots 2 and 3) Ni xanes on terminal particles: spot 2 very strong (Fe>>Ni, so was done with five layers Al foil to attenuate Fe signal)

  50. XANES on terminal particle Fe-edge XANES looks like Fe metal Amplitude difference probably due to overabsorption TP Fe foil

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