Submicron spatial resolution Pb–Pb and U–Pb dating by using a NanoSIMS equipped with the new radio-frequency ion source

Abstract

This paper first reports a Pb-Pb and U-Pb analytical method at a sub-micron scale using NanoSIMS equipped with the new radio-frequency (RF) ion source. The RF ion source can generate...

High spatial resolution and precision NanoSIMS for sulfur isotope analysis

“…36 In the NanoSIMS region, the primary beam is usually rastered on the sample surface instead of statically focusing the beam to sputter a steep-sided crater and induce the depth effect. 37,38 Therefore, the spatial resolution of the isotope analysis, equated with the analysis area (scan area of the primary beam), is largely based on the primary beam current. A high primary current leads to a high secondary ion rate (counts per second), but a large raster size to stabilize the secondary ion beam (SIB) (sputter in the steady state sputtering regime).…”

Atomic spectrometry update – a review of advances in environmental analysis

“…As in previous years, several contributions focused on high-precision isotope ratio measurements on various minerals . These included: improved precision for δ 37 Cl measurements on apatite 279 using a FC fitted with a 10 12 Ω amplifier to collect 37 Cl; δ 94 Zr measurements on zircon 280 with an external precision (2SD) of 0.04–0.7‰; improved precision for U–Pb dating of zircons 281 in U-series disequilibrium; Li isotope ratios in garnet 282 using specially-developed glass RMs prepared from either natural garnets or oxide and silicate powders; and Pb–Pb and U–Pb dating of Zr-rich minerals 283 at sub-μm spatial resolution.…”

High-Spatial-Resolution Measurement Of Water Content In Olivine Using NanoSIMS 50L

“…Raster area and spatial resolution. Considering that a high beam energy density would lead to a more significant depth effect on Hdetermination, 40,49 various raster area sizes for water content analysis were also tested. Measurements with raster sizes ranging from 10 × 10 μm 2 to 2 × 2 μm 2 were carried out on KLB-1 olivine.…”

“…On the one hand, the unique co-axial design of NanoSIMS reduces the spot size, which permits the analysis of much smaller minerals and mapping of the elemental distribution in crystal micro-structures. 9,27,28,31,[38][39][40][41][42][43][44][45][46] On the other hand, NanoSIMS has a smaller analysis chamber which is helpful in decreasing the chamber vacuum and thus, the hydrogen background. Although previous studies have reduced the background for water analysis to < 10 ppm by using NaonSIMS, the spatial resolution was restricted to > 10 μm.…”