What Are the Advantages of a FE-EPMA or FE-SEM (Even When Not Analyzing Submicron Features at Low kV and High Beam Current)?

The article focuses on the advantages of field emission (FE) electron probe microanalyzers (EPMA) and FE scanning electron microscopes (SEM) compared to traditional tungsten (W) and lanthanum hexaboride (LaB6) electron sources. FE guns, particularly Schottky thermal field emission types, provide higher beam current stability, smaller probe diameters (down to ~100 nm for mapping), and improved spatial resolution at low accelerating voltages (kV), enabling accurate quantitative analysis and elemental mapping of submicron features. These capabilities are especially beneficial for analyzing beam-sensitive samples, reducing hydrocarbon contamination, and improving imaging modes such as backscattered electron (BSE) composition and topography, as well as cathodoluminescence (CL) imaging. Additionally, FE EPMA systems exhibit rapid stabilization of beam current after changes in accelerating voltage or beam current, enhancing throughput and data quality. The article emphasizes that these technological improvements allow for more precise microanalysis without sacrificing resolution, even at low kV and high beam currents.