Electron Energy Loss Spectroscopy (EELS)

Electron energy loss spectroscopy (EELS) is an analytical technique that enables atomic level chemical and structural characterization of materials, using their electron energy loss spectra. The Infinita Lab network of testing labs, USA, offers the EELS test to our clients in the USA and worldwide.

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

Electron Energy-Loss Spectroscopy (EELS) is an advanced materials analysis technique that employs a transmission electron microscope. EELS is used to obtain material composition data and determine materials’ bonding, electronic, and oxidation states. Materials engineers and researchers use EELS to obtain quantitative materials composition data at atomic resolution. EELS is an essential tool for obtaining critical information on the chemical and electronic structures of sub-nano materials, which is needed to support advanced materials programs, quality assurance programs, and failure analysis programs.

Scope, Applications, and Benefits

Scope

EELS is a characterization technique that measures the energy lost by incident electrons upon interaction with a sample in a transmission electron microscope, providing data about elements and their chemical bonding at atomic resolution at specific analysis points, lines, or areas.

EELS analysis evaluates:

Elemental composition and quantitative chemical analysis at atomic-scale spatial resolution
Chemical bonding state, oxidation state, and coordination environment identification
Electronic structure characterization using near-edge fine structure (ELNES) analysis
Light element detection, including carbon, nitrogen, oxygen, and boron, at nanometer resolution
Phase identification and interface chemistry across material boundaries and thin film systems

Applications

Advanced metals, alloys, and intermetallic compounds requiring atomic-scale chemical characterization
Semiconductor devices, thin films, and nanoscale electronic material systems
Ceramic, oxide, and nitride materials requiring chemical bonding and oxidation state analysis
Failure analysis investigations requiring nanoscale elemental and chemical root cause evaluation
Academic and industrial research programs requiring atomic-resolution chemical characterization data

Benefits

Provides atomic-scale elemental and chemical bonding data unavailable through conventional analytical techniques
Supports advanced material development, process optimization, and nanoscale quality assurance programs
Identifies nanoscale chemical failure mechanisms in support of root cause failure analysis
Delivers traceable, quantitative chemical characterization data
Reduces material development risk by providing atomic-resolution chemical intelligence early in the design cycle

Test Process

Sample Preparation

Specimens thinned to electron transparency by FIB, ion milling, or electropolishing.

TEM & EELS Setup

Specimen loaded into TEM and EELS spectrometer configured for target analysis region.

Data Acquisition

Electron beam positioned on target region collecting characteristic energy loss spectra.

Data Analysis & Reporting

Energy loss spectra processed to generate elemental composition and chemical bonding data.

Technical Specifications

Parameter	Details
Applicable Materials	Semiconductors, thin films, ceramics, metals, oxides, and advanced material systems
Analysis Technique	Electron energy loss spectroscopy within transmission electron microscope
Spatial Resolution	Nanometer to atomic-scale elemental and chemical bonding analysis
Measured Parameters	Elemental identity, chemical bonding state, oxidation state, electronic structure
Measured Outputs	Energy loss spectra, elemental maps, bonding state data, test compliance result

Instrumentation Used for Testing

Aberration-corrected transmission electron microscope with EELS spectrometer system
Monochromator for high-energy resolution spectroscopy applications
Focused ion beam system for TEM specimen preparation
Automated spectrum acquisition and elemental mapping software
Specialist EELS analysis and post-processing software
Data reporting and visualization system

Results and Deliverables

EELS spectra and elemental maps with defined analysis area and acquisition parameter documentation
Quantitative elemental composition data at defined analysis points and mapped regions
Chemical bonding state and oxidation state identification from near-edge fine structure analysis
Phase identification and interface chemistry characterization across material boundaries
EELS analysis report

Why Choose Infinita Lab for Electron Energy Loss Spectroscopy (EELS)?

At the core of this breadth is our network of 2,000+ accredited labs in the USA, offering access to over 10,000 test types. From advanced metrology (SEM, TEM, RBS, XPS) to mechanical, dielectric, environmental, and standardized ASTM/ISO testing, we give clients unmatched flexibility, specialization, and scale. You’re not limited by geography, facility, or methodology—Infinita connects you to the right testing, every time.

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote

Frequently Asked Questions

EELS is an analytical technique that uses a transmission electron microscope to obtain information on elemental composition, bonding, oxidation states, and electronic structure at atomic resolution, providing chemical composition not obtainable through other analytical microscopy techniques.

EDS spectrum has distinct peaks that correspond to the characteristic X-rays released by the atoms of the various elements present in the sample. EELS analyzes the energy distribution of electrons that were inelastically dispersed while traveling through the sample.

EELS improves signal-to-noise ratio, spatial resolution (down to 1 nm), energy resolution (<1 eV), and sensitivity to elements with lower atomic numbers.

EELS can analyze metals, alloys, ceramics, semiconductors, oxides, nitrides, and thin-film material systems, and it offers atomic-scale information about the elemental composition, chemistry, and electronic structure of a broad range of technologically important and scientifically interesting materials.

HREELS is an electron energy loss spectroscopy (EELS) technique that investigates the inelastic scattering of electrons from surfaces.