History of trace gases in presolar diamonds inferred from ion-implantation experiments

Details History of trace gases in presolar diamonds inferred from ion-implantation experiments History of trace gases in presolar diamonds inferred from ion-implantation experiments

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001natur.412..615k&link_type=abstract

Nature, Volume 412, Issue 6847, pp. 615-617 (2001).

Other

19

Scientific paper

Diamond grains are the most abundant presolar grains found in primitive meteorites. They formed before the Solar System, and therefore provide a record of nuclear and chemical processes in stars and in the interstellar medium. Their origins are inferred from the unusual isotopic compositions of trace elements-mainly xenon-which suggest that they came from supernovae. But the exact nature of the sources has been enigmatic, as has the method by which noble gases were incorporated into the grains. One observation is that different isotopic components are released at different temperatures when the grains are heated, and it has been suggested that these components have different origins. Here we report results of a laboratory study that shows that ion implantation (previously suggested on other grounds) is a viable mechanism for trapping noble gases. Moreover, we find that ion implantation of a single isotopic composition can produce both low- and high-temperature release peaks from the same grains. We conclude that both isotopically normal and anomalous gases may have been implanted by multiple events separated in space and/or time, with thermal processing producing an apparent enrichment of the anomalous component in the high-temperature release peak. The previous assumption that the low- and high-temperature components were not correlated may therefore have led to an overestimate of the abundance of anomalous argon and krypton, while obscuring an enhancement of the light-in addition to the heavy-krypton isotopes.

Affiliated with

Also associated with

No associations

Rating

History of trace gases in presolar diamonds inferred from ion-implantation experiments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with History of trace gases in presolar diamonds inferred from ion-implantation experiments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and History of trace gases in presolar diamonds inferred from ion-implantation experiments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-818510