Effect of cavity loading on analytical electron spin resonance spectrometry

Autor:	Ira B. Goldberg, Harry R. Crowe
Rok vydání:	1977
Předmět:	Amplitude Spectrometer Chemistry law Q factor Analytical chemistry Derivative Radiation Absorption (electromagnetic radiation) Electron paramagnetic resonance Mass spectrometry Analytical Chemistry law.invention
Zdroj:	Analytical Chemistry. 49:1353-1357
ISSN:	1520-6882 0003-2700
DOI:	10.1021/ac50017a018
Popis:	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)
Databáze:	OpenAIRE
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