Abstract
We report how the near ultraviolet Raman spectroscopy using 364nm excitation has the advantage over the conventional visible Raman spectroscopy by showing spectra obtained from a variety of inorganic materials, which can be categorized into the following four important items.(1) The lack of fluorescence in the 364nm excit-ed Raman spectra of natural fluorite (CaF2), yttrium aluminium garnet (YAG) and aluminium oxide (Al2O3) al-lows Raman spectroscopy to monitor their individual intrinsic Raman vibrational modes.(2) We show that the 364nm excited Raman spectrum of zirconium oxide (ZrO2) at 1200°C is free from the blackbody radiation back-ground, which severely hampers Raman experiments when excited with visible lights.(3) We report that in a sharp contrast to the visible light excitation the 364nm excitation allows us to measure the Raman spectrum of a PbTiO3 thin film with a thickness of 200nm deposited on a Si substrate practically free from interference of the substrate.(4) It is finally shown that the 364nm excitation is well suited for the study of local resonance effects of transition metal Raman modes such as the Cu mode in the Bi2Sr2CaCu2O8+d high TC superconductor.
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