LONGITUDINAL AND TRANSVERSE OPTICAL LATTICE VIBRATIONS IN QUARTZ
LONGITUDINAL AND TRANSVERSE OPTICAL LATTICE VIBRATIONS IN QUARTZ
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DOI：
10.1103/physrev.161.903
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发表时间：
1967-01-01
期刊：
影响因子：
--
通讯作者：
PORTO, SPS
中科院分区：
文献类型：
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作者：
SCOTT, JF;PORTO, SPS
用氩激光激发石英晶体，获得了石英晶体的振动拉曼光谱。振动归因于较早的调查多声子过程被证明是纵向分量的双简并物种E振动。观察到的频率分裂之间的纵向和横向分量的每个物种-E模式的同意非常好的值使用经典振子理论计算。α-石英中每种振动的频率和对称性与β-石英的频率和对称性相关。还讨论了由双折射和各向异性引入的并发症。它示出，由于静电力的纵向和横向振动之间的频率分裂在某些情况下，石英比由于短程原子间力的各向异性的频率偏移大得多，与文献中先前已经得出的结论相反。
The vibrational Raman spectrum of quartz has been obtained by means of argon laser excitation. Vibrations ascribed by earlier investigators to multiphonon processes are shown to be longitudinal components of the doubly degenerate species-E vibrations. The frequency splittings observed between the longitudinal and transverse components of each species-E mode are shown to agree very well with the values calculated using classical oscillator theory. The frequency and symmetry of each of the vibrations in α-quartz are correlated with those of β-quartz. A discussion of the complications introduced by birefringence and anisotropy is also presented. It is shown that frequency splittings between longitudinal and transverse vibrations due to electrostatic forces are in some cases much greater for quartz than the frequency shifts due to the anisotropy of the short-range interatomic forces, contrary to what has been concluded previously in the literature.