Thesiss

This thesis reports the isotopic compositions of different elements in a large number of presolar SiC and oxide grains in order to further increase our knowledge of nucleosynthesis in asymptotic giant branch (AGB) stars, the chemical evolution of the galaxy, and the lifetimes of…

The objective of this thesis is to describe the correlated study of individual presolar grains via Nano-scale Secondary Ion Mass Spectrometry (NanoSIMS), Transmission Electron Microscopy (TEM), and Scanning Transmission X-ray Microscopy (STXM) utilizing X-ray Absorption Near Edg…