Impulsive stimulated light scattering. I. General theory
Impulsive stimulated light scattering. I. General theory
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DOI：
10.1063/1.453733
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发表时间：
1987-12
影响因子：
4.4
通讯作者：
Yong Yan;K. Nelson
中科院分区：
文献类型：
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作者：
Yong Yan;K. Nelson
对时间分辨脉冲受激光散射（ISS）方法进行了理论分析。一个一般的理论框架来描述ISS实验的任何类型的材料模式，这是积极的光散射，符合线性响应理论。ISS实验允许通过介电响应函数G ee（q，t）对材料运动进行时间分辨观测。在理想的时间和波矢分辨率的最简单情况下，ISS信号直接给出Δ G ee（q，t）Δ 2。有限的t和q分辨率的各种后果进行了详细讨论。ISS实验上的声学和光学声子，德拜弛豫模式，和一些模式的组合进行了明确的治疗。时域脉冲受激散射和频域自发光散射光谱的详细比较在配套文件中给出。
Theoretical analysis of the time‐resolved impulsive stimulated light scattering (ISS) method is presented. A general theoretical framework is developed to describe ISS experiments on any type of material mode which is active in light scattering and conforms to linear response theory. ISS experiments permit time‐resolved observation of material motion through the dielectric response functionG ee(q,t). In the simplest case of ideal time and wave vector resolution, ISS signal gives ‖G ee(q,t)‖2 directly. Various consequences of limited t and q resolution are discussed in detail. ISS experiments on acoustic and optic phonons, Debye relaxational modes, and some combinations of modes are treated explicitly. A detailed comparison of time‐domain impulsive stimulated scattering and frequency‐domain spontaneous light‐scattering spectroscopy is presented in the companion paper.