electron spin resonance
very lowtechnical/scientific
Definition
Meaning
A physical phenomenon in which unpaired electrons in a material absorb electromagnetic radiation when placed in a magnetic field.
A spectroscopic technique used to study materials with unpaired electrons by measuring the absorption of microwave radiation in a magnetic field, widely applied in chemistry, physics, biology and materials science.
Linguistics
Semantic Notes
Almost exclusively used in specialised scientific contexts. Often abbreviated as ESR. The term describes both the physical phenomenon and the analytical method.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage; both use the full term and abbreviation ESR interchangeably.
Connotations
None beyond technical precision.
Frequency
Equally rare and specialised in both variants.
Vocabulary
Collocations
Grammar
Valency Patterns
[technique] is used to study/investigate/characterise [material]The [material] was analysed by/using [technique][technique] spectroscopy/measurementsVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used.
Academic
Exclusively in scientific research papers, theses, and advanced textbooks in chemistry, physics, and related fields.
Everyday
Never used.
Technical
The primary domain of use; essential terminology in analytical chemistry, solid-state physics, biochemistry, and materials science.
Examples
By Part of Speech
adjective
British English
- The ESR spectrometer was calibrated.
- We obtained an ESR spectrum.
American English
- The ESR spectroscopy data was conclusive.
- An ESR-active compound was synthesised.
Examples
By CEFR Level
- Electron spin resonance is a technique used to detect unpaired electrons.
- Scientists use ESR to study free radicals in chemical reactions.
- The research utilised electron spin resonance spectroscopy to characterise the paramagnetic centres in the novel material.
- By analysing the hyperfine splitting in the ESR spectrum, they determined the local electronic structure.
Learning
Memory Aids
Mnemonic
Think: ELECTRONS SPINning, and scientists RESONATING (tuning in to) their signal with radio waves.
Conceptual Metaphor
Listening to the magnetic 'whisper' of spinning electrons.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque of individual words. The standard Russian term is 'электронный парамагнитный резонанс (ЭПР)', which literally translates to 'electron paramagnetic resonance'—a synonym, not a word-for-word match.
Common Mistakes
- Incorrect word order (e.g., 'spin electron resonance').
- Confusing it with NMR (Nuclear Magnetic Resonance), which deals with atomic nuclei, not electrons.
- Using it as a general term for any magnetic resonance technique.
Practice
Quiz
What is the primary subject of study in Electron Spin Resonance?
FAQ
Frequently Asked Questions
It is primarily used to study materials containing unpaired electrons, such as free radicals, transition metal complexes, and defects in solids, providing information about their structure, identity, and environment.
ESR probes the magnetic properties of unpaired electrons, while NMR (Nuclear Magnetic Resonance) probes the magnetic properties of atomic nuclei (like hydrogen or carbon). They operate at different frequency ranges.
It refers to the intrinsic angular momentum (a quantum property) of the electron, which gives it a magnetic moment, allowing it to interact with external magnetic fields.
No, it is very rare in medicine. MRI (Magnetic Resonance Imaging) is based on NMR principles (nuclei), not ESR. ESR is mainly a research tool in chemistry and materials science.