I have been trying to reproduce some polar plots from literature using polarized Raman spectroscopy on my material. But I am not getting any four petal plots as mentioned in the literature. I have changed the experimental parameters and did many trial and errors. Will the experimental set up and the location of polarizers affect the number of petals of polar plots? Someone working on this please help
Polarize Raman spektrumlarında açı ölçümleri Polarizasyonun konumuna, kutup parsellerine, yaprak sayısına bağlıdır. Bu değişkenler ve polarize raman spektroskopisinin aynı zamanda bu spektrumların etki edeceği alana da bağlıdır. Yaprakların(kanatların) sayısı ve açıklığı raman spektrumlarının etki edeceği alanı belirler.
May I ask you what kind of sample you use? Is it a single crystal?
What is its symmetry? Is it optically uniaxial, orthorhombic, monoclinic or triclinic?
Monoclinic and triclinic crystals are much more complicated, because in the general case light becomes elliptically polarized. If you want to have nice plots, use a uniaxial or an orthorhombic crystal and arrange it in a way that the polarization directions are parallel to the crystallographic axis to preserve linear polarization. For a monoclinic crystal linear polarization is definitely preserved for light that is polarized parallel to the crystallographic b-axis, but in a 90° geometry this does not help except if you polarize the light either parallel or perpendicular to the b-axis.
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