Electron energy loss spectroscopy measures the energy transferred from incident electrons to a specimen. A transmitted-electron spectrometer separates nearly unscattered electrons from electrons that excited collective modes, atomic transitions or core-level processes.
The zero-loss feature supplies an energy reference, and losses can be reported as . Element-specific edges and their energy-loss near-edge structure constrain composition and bonding. A thicker specimen can produce several losses in one trajectory, so the recorded electron energy loss spectroscopy response need not equal a single-interaction response. [ref]
Electron energy-loss spectroscopy by JEOL. JEOL EELS glossary: inelastic-scattering spectra and their information
Energy-loss near-edge structure is the detailed shape near an inner-shell excitation edge in an electron energy loss spectroscopy measurement. Transition probabilities sample accessible unoccupied electronic states, so local bonding and orientation affect the edge shape as well as elemental identity.
Comparing two specimens containing the same element can therefore reveal different electronic environments. Interpretation must account for instrumental energy resolution, the incident beam's energy spread and lifetime broadening of the states involved. [ref]
Electronic State Analysis by Monochromated STEM-EELS by JEOL. JEOL, Electronic State Analysis by Monochromated STEM-EELS: ELNES and resolution limits
A small peak difference alone does not uniquely determine one atomic arrangement. Articles by others on the same topic
Electron Energy Loss Spectroscopy (EELS) is a powerful analytical technique used primarily in electron microscopy to study the elemental and electronic properties of materials at the nanoscale. It involves the interaction of high-energy electrons with a specimen. Here’s how it works and its key aspects: ### Principle: 1. **Electron Beam Interaction**: A high-energy electron beam is directed at a thin sample, usually a few nanometers thick, to minimize scattering and ensure that the beam can pass through the specimen.