Electron Energy Loss Spectroscopy
Electron Energy Loss Spectroscopy - Related Videos
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Source: David C. Powers, Tamara M. Powers, Texas A&M In this video, we will learn the basic principles behind Electron Paramagnetic Resonance (EPR). We will use EPR spectroscopy to study how dibutylhydroxy toluene (BHT) behaves as an antioxidant in the autoxidation of aliphatic aldehydes.
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Energy Losses in Transformers
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In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality, the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses. There are four main reasons for energy losses in transformers. The first cause can be the high resistance of the copper windings...
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Scanning-probe Single-electron Capacitance Spectroscopy
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Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
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Mössbauer Spectroscopy
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Source: Joshua Wofford, Tamara M. Powers, Department of Chemistry, Texas A&M University Mössbauer spectroscopy is a bulk characterization technique that examines the nuclear excitation of an atom by gamma rays in the solid state. The resulting Mössbauer spectrum provides information about the oxidation state, spin state, and electronic environment around the target atom, which, in combination, gives evidence about the electronic structure and ligand arrangement (geometry) of the molecule.
FAQs
These features arise from different interactions between the electron beam and the specimen. Plasmon losses reflect collective oscillations, interband transitions indicate electronic transitions between bands, and inner-shell ionization produces losses associated with tightly bound electrons. Comparing their energy-loss signatures helps connect spectral features with composition, electronic structure, and material response.
Energy-loss features provide information beyond identifying which elements are present. Their relationship to electronic excitations can reveal aspects of bonding and dielectric behavior, helping researchers examine how a material responds to the electron beam. This makes EELS valuable when engineering studies require local chemical information together with electronic or functional-property information.
A focused electron beam can interrogate selected locations within a thin specimen, allowing spectra to be compared across different regions. Such spatially resolved measurements support maps of elemental distributions and investigation of nanoscale interfaces. In engineering materials, this local perspective can distinguish chemically or electronically different regions that broader measurements may not separate.
The measurement begins by preparing a sufficiently thin specimen for electron transmission or scattering analysis. A focused beam is directed onto the selected region, where interactions produce energy losses. An energy spectrometer then records those losses, and researchers interpret the resulting features to assess composition, electronic structure, bonding, dielectric properties, or spatial distributions.
Each component supports a different part of the analysis. The thin specimen permits the beam to interact with material in a transmission electron microscope, the focused beam enables examination of selected local regions, and the spectrometer resolves the energy lost by electrons. Together, these conditions provide localized chemical and electronic information rather than only bulk-level characterization.
Engineering researchers apply EELS to catalysts, semiconductors, batteries, and other advanced materials when local composition or electronic behavior affects performance. Measurements can reveal elemental distributions, bonding, dielectric properties, and nanoscale interfaces. These results help connect material structure and chemistry with design decisions and performance optimization in technologically important systems.