Fourier moment analysis of velocity-map ion images
Fourier moment analysis of velocity-map ion images
复制标题
速度图离子图像的傅里叶矩分析
DOI：
10.1063/1.1514978
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发表时间：
2002
影响因子：
4.4
通讯作者：
C. Vallance
中科院分区：
文献类型：
--
作者：
M. J. Bass;M. Brouard;A. P. Clark;C. Vallance
本文提出了一种从速度图离子图像中提取动力学信息的方法，用以代替逆Abel变换和前向卷积方法。与大多数竞争方法不同，这里提出的方法不要求探测的三维分布具有圆柱对称性。新方法涉及分析在不同的实验几何形状测量的图像的傅立叶矩，并允许速度分布，角微分截面，角动量的对齐和方向来确定从原始图像的光解和光子引发的双分子反应的产物。该方法是在狄克逊的双极矩形式主义[R. N.狄克逊，化学物理杂志85，1866（1986）]，尽管它同样适用于产物散射分布的其它常用公式。为了允许比较的方法与阿贝尔反演，这需要的速度分布的探测产品已经…
An alternative to inverse Abel transform and forward convolution methods is presented for extracting dynamical information from velocity-map ion images. Unlike most competing methods, that presented here does not require the probed three-dimensional distribution to possess cylindrical symmetry. The new method involves analysis of the Fourier moments of images measured in different experimental geometries, and allows speed distributions, angular differential cross sections, and angular momentum alignment and orientation to be determined from raw images of the products of photodissociation and photon-initiated bimolecular reactions. The methodology is developed within the semiclassical framework of Dixon’s bipolar moment formalism [R. N. Dixon, J. Chem. Phys. 85, 1866 (1986)], although it is equally applicable to other common formulations of the product scattering distribution. To allow a comparison of the method with the Abel inversion, which requires that the velocity distribution of the probed product ha...