Atom-probe analyses of nanodiamonds from Allende

Philipp R. Heck*, Frank J. Stadermann, Dieter Isheim, Orlando Auciello, Tyrone L. Daulton, Andrew M. Davis, Jeffrey W. Elam, Christine Floss, Jon Hiller, David J. Larson, Josiah B. Lewis, Anil Mane, Michael J. Pellin, Michael R. Savina, David N. Seidman, Thomas Stephan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Atom-probe tomography (APT) is currently the only analytical technique that, due to its spatial resolution and detection efficiency, has the potential to measure the carbon isotope ratios of individual nanodiamonds. We describe three different sample preparation protocols that we developed for the APT analysis of meteoritic nanodiamonds at sub-nm resolution and present carbon isotope peak ratios of meteoritic and synthetic nanodiamonds. The results demonstrate an instrumental bias associated with APT that needs to be quantified and corrected to obtain accurate isotope ratios. After this correction is applied, this technique should allow determination of the distribution of 12C/13C ratios in individual diamond grains, solving the decades-old question of the origin of meteoritic nanodiamonds: what fraction, if any, formed in the solar system and in presolar environments? Furthermore, APT could help us identify the stellar sources of any presolar nanodiamonds that are detected.

Original languageEnglish (US)
Pages (from-to)453-467
Number of pages15
JournalMeteoritics and Planetary Science
Volume49
Issue number3
DOIs
StatePublished - Mar 2014

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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