Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e...3h&link_type=abstract
Pre-Solar Grains as Astrophysical Tools, 26th meeting of the IAU, Joint Discussion 11, 21 August 2006, Prague, Czech Republic, J
Other
Scientific paper
Introduction: Primitive meteorites and interplanetary dust particles (IDPs) contain small amounts (ppb-ppm) of nm- to μm-sized presolar dust grains that formed in the winds of evolved stars or in the ejecta of stellar explosions. The first presolar minerals, diamond and silicon carbide (SiC), were found in 1987, followed by graphite, silicon nitride, and refractory oxides in the 1990s. Isotopic measurements on individual presolar grains, most of which were made by secondary ion mass spectrometry (SIMS), allowed to obtain a wealth of astrophysical information. Until the end of the last century, the isotope studies of individual grains were restricted to the light to intermediate-mass elements in grains > 1 μm. The presolar grain research received a new push in recent years with the application of laser ablation and resonant ionization mass spectrometry (RIMS) and with the invention of the NanoSIMS ion microprobe. RIMS: This analysis technique has been successfully applied to measure the isotopic compositions of the heavy elements Sr, Zr, Mo, and Ba in individual, μm-sized presolar SiC and graphite grains. These measurements have substantiated the view that the majority of presolar SiC originates from low-mass AGB stars and have provided detailed insights into neutron-capture reactions in AGB stars (s-process) and supernova explosions (neutron burst). NanoSIMS: The merit of the NanoSIMS is that it allows to extend isotopic studies to much smaller scales than was previously possible (< 100 nm compared to 1 μm with conventional SIMS). This led to the identification of presolar silicate grains, first in IDPs and later also in primitive meteorites. Because also the majority of other presolar minerals are submicrometer in size, use of the NanoSIMS allows to access this important reservoir of presolar matter on a single grain basis. And, finally, isotopic heterogeneities within μm-sized presolar SiC and graphite could be detected.
No associations
LandOfFree
New Science from New Technology: NanoSIMS and RIMS 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 New Science from New Technology: NanoSIMS and RIMS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Science from New Technology: NanoSIMS and RIMS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1785088