Abstract

The light-induced yellowing of the surface of paper made from a <i>Eucalyptus regnans</i> chemimechanical pulp has been studied by using second-derivative diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy in the region 1550 to 1800 cm⁻¹. The observed reflectances were transformed to Kubelka-Munk units and the second derivatives obtained. Use of the second derivative technique has resulted in reduced bandwidths, enabling bands such as that at 1612 cm⁻¹ arising from exocyclic C=C bonds in lignin to be resolved from the broad envelope of the strong C=C ring stretching band at 1591 cm⁻¹. The improved resolution has enabled the effects of UV light on the population of potential chromophoric C=O and C=C groups in paper surfaces to be studied more precisely.

Second derivative diffuse reflectance spectroscopy for estimating tissue hypoxia

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OSA Continuum 4(2) 650-664 (2021)

Time-resolved studies of light propagation in paper

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Appl. Opt. 34(9) 1528-1535 (1995)

Extraction of information from laser-induced breakdown spectroscopy spectral data by multivariate analysis

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Derivative Spectroscopy

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Micro-DRIFTS for small area hyper-black spectroscopy

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