Sum-frequency phonon spectroscopy on α-quartz
Sum-frequency phonon spectroscopy on α-quartz
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DOI：
10.1103/physrevb.78.024302
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发表时间：
2008-07-01
影响因子：
3.7
通讯作者：
Shen, Y. R.
中科院分区：
文献类型：
--
作者：
Liu, Wei-Tao;Shen, Y. R.
我们在这里以 α-石英为例证明，红外-可见和频 (SF) 光谱可用于探测晶体的区中心光学声子，而无需反演对称性。因为在 SF 过程中只允许红外和拉曼激活模式，所以观察到的声子谱被大大简化。 SF 光谱固有的灵活性还可以更准确地确定相关拉曼极化率的相对幅度和符号。
We demonstrate here, using alpha-quartz as an example, that IR-visible sum-frequency (SF) spectroscopy can be employed to probe zone-center optical phonons of crystals without inversion symmetry. Because only modes both IR and Raman active are allowed in the SF process, the observed phonon spectrum is greatly simplified. The intrinsic flexibility of SF spectroscopy also permits more accurate determination of relative magnitudes and signs of relevant Raman polarizabilities.