Some proposed improvements in the scanning ion microprobe

Area of Science:

• Materials Science
• Analytical Chemistry
• Physics

Background:

• Current ion microprobe technology faces limitations in spatial resolution.
• Autoradiography is a common technique for tracing, but has drawbacks.

Purpose of the Study:

• To investigate improvements for achieving a scanning ion microprobe with approximately 15 nm spatial resolution.
• To explore the potential of stable isotope tracing using advanced ion microprobe technology.

Main Methods:

• Utilized a field-evaporation (EHD) ion source with liquid gallium, achieving high brightness (>10^10 A m-2 sr-1 at 21 KeV).
• Implemented a high-efficiency (10%) secondary ion collection system.
• Enhanced secondary ion yield through cesium deposition.

Main Results:

• The combined improvements facilitate a scanning ion microprobe with a spatial resolution of about 15 nm.
• The new instrument demonstrates superior performance characteristics for ion analysis.

Conclusions:

• The developed scanning ion microprobe offers significant advancements in spatial resolution.
• Stable isotope tracing with this instrument presents advantages compared to autoradiography.