We have constructed an on-line system of photoacoustically detected magnetic resonance (PADMR) com-posed of an electron spin resonance (ESR) system, a photoacoustic cell and an on-line computer. PADMR spectra of multi-layer model samples containing different paramagnetic substances were measured by this system. PADMR spectra for the respective layer in the three-layered model sample could be obtained using Fourier transform (FT) correlation photoacoustic spectroscopy (PAS) technique.
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