Meaning
Dual beam analytical instrumentation combines ion beam milling with electronic imaging to inspect and modify materials at the nanometer scale. This focused ion beam scanning electron microscopy configuration uses a gallium ion source to remove surface atoms while simultaneously recording high resolution secondary electron images. The system enables site specific sample preparation, including the extraction of thin lamellae for transmission electron microscopy analysis.
Sample Modification
Operators utilize the ion beam to perform localized deposition of metals or insulators using precursor gases. Precision cutting allows the removal of material to expose cross sections of buried defects or internal interfaces within a solid. Subsurface features appear clearly during the milling process because the electrons monitor the geometry of the trench in real time.
Imaging Mechanism
High energy primary electrons strike the surface of the specimen to generate secondary signals for topographic mapping. Detectors capture these particles to construct a visual representation of the surface morphology with depth of field capabilities exceeding optical light tools. Backscattered electrons provide additional information regarding the composition of the sample based on atomic number differences across the field of view.
Analytical Outcome
Researchers obtain three dimensional reconstructions of internal structures by collecting sequential slices through the bulk material. Successive removal of layers creates a stack of two dimensional images that the software aligns into a complete volumetric model. Accurate spatial data from these reconstructions determines the porosity, grain distribution, and connectivity of complex components within electrochemical devices.
