NanoSIMS sulfur isotopic analysis at 100 nm scale by imaging technique.

ABSTRACT: NanoSIMS has been widely used for in-situ sulfur isotopic analysis (³²S and ³⁴S) of micron-sized grains or complex zoning in sulfide in terrestrial and extraterrestrial samples. However, the conventional spot mode analysis is restricted by depth effects at the spatial resolution < 0.5-1 μm. Thus sufficient signal amount cannot be achieved due to limited analytical depths, resulting in low analytical precision (1.5‰). Here we report a new method that simultaneously improves spatial resolution and precision of sulfur isotopic analysis based on the NanoSIMS imaging mode. This method uses a long acquisition time (e.g., 3 h) for each analytical area to obtain sufficient signal amount, rastered with the Cs⁺ primary beam of ∼100 nm in diameter. Due to the h

SUBMITTER: Hao JL 

PROVIDER: S-EPMC10062601 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature