Effect of Cavity Loading on Analytical Electron Spin Resonance Spectrometry.

Abstract

The effect of cavity loading during magnetic resonance absorption of the accuracy of analysis by electron spin resonance techniques is calculated. Large samples, which degrade the cavity Q-factor due to absorption of a large fraction of the incident radiation cause a non-linearity of the absorption as a function of concentration. This is reflected by a broadening of the first derivative spectrum and reductions of the peak-to-peak amplitude and the double integral of the derivative from that predicted on the basis of diluted sample. Calculations of this effect are verified with samples of MnSO4 H2O. Nonlinearities in the order of 1% may be obtained with samples of 0.4 to 1.0 mg of MnSO4 H2O. or 0.1 to 0.25 mg of diphenylpicrylhydrazyl (DPPH) which are commonly used standards. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1977
Accession Number
ADA035726

Entities

People

  • Harry R. Crowe
  • Ira B. Goldberg

Tags

Communities of Interest

  • Advanced Electronics
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Chemistry
  • Electron Paramagnetic Resonance
  • Electron Spin Resonance
  • Magnetic Fields
  • Magnetic Phenomena
  • Magnetic Resonance
  • Military Research
  • Paramagnetic Materials
  • Paramagnetic Resonance
  • Radiation
  • Resonance
  • Resonance Absorption
  • Resonant Frequency
  • Spectra
  • Spin Resonance
  • Standards

Fields of Study

  • Physics

Readers

  • Molecular Photonics/Laser Physics
  • Optical Physics and Photonics.
  • Organic Chemistry

Technology Areas

  • Microelectronics