The effect of particle size on fourier-transform infrared photoacoustic spectra |
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| Affiliation: | 1. Research Unit in Environmental and Evolutionary Biology (URBE), University of Namur, Belgium;2. Research Unit in Cell Biology (URBC), Narilis (Namur Research Institute for Lifesciences), University of Namur, Belgium;1. Advanced Materials Lab, Department of Applied Physics, S.V. National Institute of Technology, Surat 395007, India;2. Chemical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar 382355, India;3. FCIPT, Institute for Plasma Research, Sector-25, Gandhinagar 382044, India;4. Computational Materials and Nanoscience Group, Department of Physics, St. Xavier''s College, Ahmedabad 380009, India |
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| Abstract: | The effect of particle size on infrared photoacoustic spectra has been investigated by use of naturally occurring quartz. It is observed that the PAS peak intensities increase with a decrease in particle diameter and that the peak intensity ratios are not constant for particles of different diameters. When the particle diameter becomes smaller than the thermal diffusion length for a specific peak, a more dramatic increase in peak intensity is observed. It is also found that the PAS peak shape deteriorates with an increase in particle diameter. The effect of optical velocity of the interferometer on PAS peak intensities is also reported. |
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