Near-infrared photoacoustic FTIR spectroscopy of clay minerals and coal
1986; Pergamon Press; Volume: 26; Issue: 3 Linguagem: Inglês
10.1016/0020-0891(86)90016-3
ISSN1878-1160
AutoresJ. C. Donini, Kirk H. Michaelian,
Tópico(s)Soil Geostatistics and Mapping
ResumoNear-infrared (NIR) photoacoustic spectra of kaolinite, cation-exchanged bentonites and coal have been obtained by reducing the velocity of the moving mirror in a commercial rapid-scan Fourier transform infrared (FTIR) spectrometer so that the characteristic photoacoustic cell resonance no longer falls in the NIR spectral region. The observed NIR bands of kaolinite are attributable to combinations of OH-stretching and AIOH-bending vibrations, and to overtones of OH-stretching modes. Bentonites give rise to bands due to combination of OH-stretching with AlOH- or HOH-bending, as well as overtones of OH-stretching vibrations. Spectra of two separated macerals of sub-bituminous coal show continuous absorption which extends beyond 10,000 cm−1 and arises from low-energy electronic transitions.
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