Definition

1. Noun:
   • A spectroscopic technique: Electron spin resonance (ESR) is a method in microwave spectroscopy where a paramagnetic substance exhibits resonant absorption of electromagnetic radiation. It is used to study materials with unpaired electrons by observing their interaction with a magnetic field.

Usage

• Noun:
  • Electron spin resonance is a crucial tool for studying free radicals in chemical reactions.
  • The researcher used electron spin resonance to analyze the paramagnetic defects in the crystal lattice.

Advanced Usage

• "Continuous-wave electron spin resonance (CW-ESR)": A standard ESR method where the microwave frequency is held constant while the magnetic field is swept to observe resonance.

  • Continuous-wave electron spin resonance provided a clear spectrum of the organic radical.

• "Pulsed electron spin resonance": A more advanced technique using short microwave pulses to investigate electron spin dynamics.

  • Pulsed electron spin resonance can measure relaxation times of unpaired electrons.

Variants and Related Words

• ESR: A common abbreviation for electron spin resonance.

  • The ESR spectrum confirmed the presence of the transition metal ion.

• Electron paramagnetic resonance (EPR): A fully synonymous term for electron spin resonance.

  • Electron paramagnetic resonance is often used interchangeably with ESR in the literature.

Synonyms

• Electron paramagnetic resonance (EPR): The alternative name for the same spectroscopic technique.
• Spin resonance spectroscopy: A broader term that can encompass ESR.

Related Phrases

• ESR spectroscopy: The field or practice of using electron spin resonance.

  • ESR spectroscopy has applications in both physics and biology.

• ESR signal: The specific absorption peak or pattern detected in an ESR experiment.

  • The intensity of the ESR signal is proportional to the number of unpaired spins.

Noun

1. microwave spectroscopy in which there is resonant absorption of radiation by a paramagnet