Electron paramagnetic resonance spectra from polycrystalline samples of Fe III tetraphenylporphyrin with gaseous molecular oxygen at atmospheric pressure have been studied by means of the photoacoustic effect. The different dependency of the signal amplitudes on the modulation frequency and the phase shift between the absorption lines of the solid and gaseous paramagnetic species were analyzed in the present investigation.
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Netzelmann et al. (1982) studied this question.
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