<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0015.gif" overflow="scroll"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:none/><mml:none/><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>/</mml:mo><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:none/><mml:none/><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:mmultiscripts><mml:mi mathvarian

Lewis, J. B.; Isheim, Dieter; Floss, C.; Seidman, David N.

doi:10.1016/j.ultramic.2015.05.021

Cited by 32 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The state-of-the-art performance in local mass analysis can be achieved with atom-probe tomography34 (APT), which can record images with sub-nanometer spatial resolution in all three dimensions. A recent APT study of the 13 C/ 12 C ratio in detonation nanodiamonds reported a precision of 5%, but biases in the detection of differently charged ions limited accuracy to ∼25% compared to the natural isotope abundances35.…”

Section: Discussionmentioning

confidence: 99%

Isotope analysis in the transmission electron microscope

et al. 2016

View full text Add to dashboard Cite

The Ångström-sized probe of the scanning transmission electron microscope can visualize and collect spectra from single atoms. This can unambiguously resolve the chemical structure of materials, but not their isotopic composition. Here we differentiate between two isotopes of the same element by quantifying how likely the energetic imaging electrons are to eject atoms. First, we measure the displacement probability in graphene grown from either 12C or 13C and describe the process using a quantum mechanical model of lattice vibrations coupled with density functional theory simulations. We then test our spatial resolution in a mixed sample by ejecting individual atoms from nanoscale areas spanning an interface region that is far from atomically sharp, mapping the isotope concentration with a precision better than 20%. Although we use a scanning instrument, our method may be applicable to any atomic resolution transmission electron microscope and to other low-dimensional materials.

show abstract

Section: Discussionmentioning

confidence: 99%

Isotope analysis in the transmission electron microscope

et al. 2016

View full text Add to dashboard Cite

show abstract

“…It is possible that a subset of the acid residue is presolar, and the rest formed in the solar system with the terrestrial carbon and nitrogen from the solar material diluting anomalous signals from the presolar fraction to such a degree that it goes undetected in bulk measurements of millions of nanodiamonds. In this article we use atom probe tomography (APT) to measure the 12 C/ 13 C ratio of smaller fractions of acid residue than previously characterized [7][8][9]. We cannot study Xe with this approach because its concentration is too low for us to expect detection of even a single meteoritic Xe atom in samples of our size.…”

Section: Introductionmentioning

confidence: 99%

Distinguishing Meteoritic Nanodiamonds from Disordered Carbon Using Atom-Probe Tomography

et al. 2018

View full text Add to dashboard Cite

show abstract

“…2) [10]. Laboratory detonation synthesized NDs were used as a standard to detect and normalize for artifacts in isotopic measurements, and statistical techniques were employed to correct for multihit signal loss [9,11]. Using density maps and trace element analysis we assessed the possible loss of NDs during field-evaporation from the surfaces of nanotips [12].…”

mentioning

confidence: 99%

Isotopic Composition and Origin of Meteoritic Nanodiamonds studied by Atom-Probe Tomography and Complementary Techniques

et al. 2019

View full text Add to dashboard Cite

Presolar grains, which formed in the outflows of distant stars, are the only source of information from other star systems that is accessible to direct laboratory microanalysis [1]. Meteoritic nanodiamonds (NDs), separated from carbonaceous chondrite meteorites by acid dissolution [2], are the smallest suspected type of presolar grain, 3 nm in median diameter [3]. Bulk analyses of billions of NDs in aggregate, accompanied by disordered C and other acid residue, have been conducted by stepped heating. They reveal trace amounts of isotopically anomalous Xe-HL, which originates from corecollapse supernovae [4,5], but bulk measurements of the C isotopic ratios are within the limits of variation in our solar system [6, and references therein]. Isotopic analysis of individual NDs is necessary to solve the mystery of their origins and to connect our knowledge of NDs to our knowledge of the stars.

show abstract

C12/C13

Cited by 32 publications

References 28 publications

Isotope analysis in the transmission electron microscope

Isotope analysis in the transmission electron microscope

Distinguishing Meteoritic Nanodiamonds from Disordered Carbon Using Atom-Probe Tomography

Isotopic Composition and Origin of Meteoritic Nanodiamonds studied by Atom-Probe Tomography and Complementary Techniques

Contact Info

Product

Resources

About