The effect of apodization and finite resolution on Fourier transform Raman spectra |
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| Affiliation: | 1. UR370 Qualité des Produits Animaux, Institut National de la Recherche Agronomique (INRA), 63122 Saint-Genès-Champanelle, France;2. Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Tsukuba 305-0901, Japan;3. SMIS Beamline, Synchrotron SOLEIL, Orme des merisiers, BP48, 91192 Gif-sur-Yvette, France;1. Technische Universität Berlin, Stranski-Laboratory for Physical and Theoretical Chemistry, Straße des 17. Juni 124, 10623 Berlin, Germany;2. Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85748 Garching, Germany;3. BAM Federal Institute for Materials Research and Testing, Division 1.9 Chemical and Optical Sensing, Richard-Willstätter-Straße 11, 12489 Berlin, Germany;4. Technische Universität Darmstadt, Fachbereich Physik, Fachgebiet Weiche Materie an Grenzflächen, Alarich-Weiss-Strasse 10, 64287 Darmstadt, Germany;5. Technische Universität München, Lichtenbergstraße 1, 85748 Garching, Germany;1. Department of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, the Netherlands;2. Department of Earth Sciences, Vrije Universiteit, Amsterdam, the Netherlands |
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| Abstract: | The effects that finite resolution and choice of apodization function have on Fourier transform (FT) Raman spectra are illustrated by the 839 cm−1 (ν1) and 914 cm−1 bands of KMnO4. FT-Raman spectra were recorded at 0.5, 1, 2, 4, 8, 16 and 32 cm−1 resolution using boxcar, Norton—Beer (strong, medium and weak) and triangular apodization functions at each resolution. The results show the dramatic changes in bandshape that occur as the ratio (resolution/true full width at half height of band) increases. The changes were measured in terms of the full width at half height of the band, the height of the band, the area of the band and the bandshape (expressed as a sum of Lorentzian and Gaussian lines). At a given resolution the degree to which each of these characteristics is affected is strongly dependent on the choice of the apodization function. |
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