Multivariate curve resolution for angle-resolved polarized Raman spectroscopy of ferroelectric crystals
Multivariate curve resolution for angle-resolved polarized Raman spectroscopy of ferroelectric crystals
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DOI：
10.35848/1347-4065/ab78e8
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发表时间：
2020-03
影响因子：
1.5
通讯作者：
S. Tsukada;Y. Fujii
中科院分区：
文献类型：
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作者：
S. Tsukada;Y. Fujii
来自晶体的拉曼光谱包含来自各种声子模式的峰的混合。角分辨偏振拉曼光谱法是利用入射光和散射光的不同偏振角获得大量光谱的一种光谱分析方法，它通过考虑拉曼张量的对称性来分离光谱峰。在本研究中，为了有效地处理大量的光谱数据，我们采用多元曲线分辨率（MCR）的拉曼光谱从一个典型的铁电PbTiO 3晶体，以减少光谱的数量进行拟合。因此，要拟合的光谱减少到三个，它们的拟合决定了所有的声子参数，如频移、宽度和积分强度。通过将三个峰的积分强度乘以通过MCR获得的角度分布来确定积分强度的角度依赖性。因此，角分辨偏振拉曼光谱结合MCR提供了一种有效的方法来确定声子参数。
Raman spectra from crystals contain a mixture of peaks from various phonon modes. Angle-resolved polarized Raman spectroscopy, in which numerous spectra are obtained with different polarization angles of incident and scattered lights, is widely used to separate peaks by considering the symmetries of the Raman tensor. In the present study, to efficiently process large amounts of spectral data, we apply multivariate curve resolution (MCR) to Raman spectra from a typical ferroelectric PbTiO3 crystal to reduce the number of spectra to be fitted. The spectra to fit are thus reduced to three, and their fits determine all the phonon parameters, such as frequency shift, width, and integrated intensity. The angle dependence of the integrated intensity was determined by multiplying the integrated intensity of the three peaks by the angle profiles obtained by MCR. Thus, angle-resolved polarized Raman spectroscopy combined with MCR provides an efficient way to determine phonon parameters.