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Polarization properties of fluctuations of the field created by randomly located dipoles

机译:随机放置的偶极子产生的场涨落的极化特性

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摘要

The vector properties of the strength of a field created by an ensemble of N parallel dipoles located, on average, uniformly are considered. For N -> infinity(,) the problem is reduced to the Poisson problem. The direction of the dipoles specifies the symmetry axis of fluctuations. The moments of probability distributions for the Cartesian components of the strength are calculated. The anisotropy of the fluctuations is approximately 15-20%. Under conditions that are of interest for spectroscopic applications, the N-particle probability distribution contains a weak broad negative background, the shape of which replicates the one-particle distribution. The analogy between the problem considered and the theory of spectral line broadening in the impact approximation, in particular, the Dicke narrowing of the Doppler profile, is analyzed. Conditions of applicability of the theory developed are discussed.
机译:考虑由平均均匀分布的N个平行偶极子的集合产生的场强的矢量性质。对于N-> infinity(,),问题简化为泊松问题。偶极子的方向指定波动的对称轴。计算强度的笛卡尔分量的概率分布矩。波动的各向异性约为15-20%。在光谱应用感兴趣的条件下,N粒子概率分布包含一个较弱的宽负背景,该背景的形状复制了一个粒子的分布。分析了所考虑的问题与冲击近似中的谱线展宽理论之间的类比,尤其是多普勒剖面的Dicke变窄。讨论了该理论的适用条件。

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