Gaussian beam effects on the photon correlation spectrum from a flowing Brownian motion system.
Gaussian beam effects on the photon correlation spectrum from a flowing Brownian motion system.
复制标题
高斯光束对流动布朗运动系统的光子相关谱的影响。
DOI：
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发表时间：
1986
期刊：
影响因子：
1.9
通讯作者：
Christopher M. Sorensen
中科院分区：
文献类型：
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作者：
Thomas W. Taylor;Christopher M. Sorensen
将扩散粒子流动系统的光子相关谱理论推广到包含入射光束的高斯形状特性。我们发现，由系统的体流引起的相干平移项的特征时间与散射体与入射光束焦点之间的距离无关。该项的特征时间由焦点处的流速和束流半径决定。我们还研究了散焦对零拍探测强度自相关函数的非相干项或数密度项的振幅的影响。我们使用流动的邻苯二甲酸二辛酯气溶胶实验验证了我们的结果。
The theory of photon correlation spectroscopy for a flowing system of diffusing particles was extended to include the Gaussian shape properties of an incident light beam. We found that the characteristic time of the coherent translational term caused by the bulk flow of the system was independent of the distance between the scattering volume and the focal point of the incident beam. The flow velocity and beam radius at the focus determined the characteristic time of this term. We also studied the effect of defocusing on the amplitude of the incoherent or number density term of the homodyne-detected intensity autocorrelation function. We verified our results experimentally using a flowing dioctylphthalate aerosol.