Measuring differential cross sections using the Doppler shift
Measuring differential cross sections using the Doppler shift
复制标题
使用多普勒频移测量差分横截面
DOI：
10.1063/1.442105
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发表时间：
1981
影响因子：
4.4
通讯作者：
D. Pritchard
中科院分区：
文献类型：
--
作者：
J. A. Serri;J. L. Kinsey;D. Pritchard
我们讨论了两种方法，其中一种是新的方法，用于从激光诱导荧光观察到的线形状的多普勒谱中恢复交叉分子束实验中的水平特异性微分截面。比较了两种方法的角分辨率，发现它们具有互补性。用这两种方法进行的实验在所有散射角度下都能得到比较好的角分辨率。第一种方法是用平行于碰撞系统的相对速度的激光束测量多普勒剖面，这一方法先前已被实验证明。在π/4和3π/4之间获得了良好的角分辨率。在本文提出的第二种方法中，以垂直于该相对速度的激光束进行多普勒剖面，在0 ~ π/4和3π/4 ~ π区域获得了最佳的角分辨率。该方法需要进行积分变换以恢复多普勒剖面的横截面。下面是这种转换的实际实现。
We discuss two methods, one of them new, for recovering level‐specific differential cross sections in crossed molecular beams experiments from the Doppler profiles of line shapes observed by laser induced fluorescence. The angular resolutions of the two methods are compared and shown to be complementary. An experiment using both methods can have moderately good angular resolution at all scattering angles. In the first method, which has previously been demonstrated experimentally, the Dopper profile is taken with the laser beam parallel to the relative velocity of the collision system. Good angular resolution is obtained between π/4 and 3π/4. In the second method, which is proposed here, the Doppler profile is taken with the laser beam perpendicular to this relative velocity, and the best angular resolution is obtained in the regions 0 to π/4 and 3π/4 to π. This method requires an integral transform to recover the cross section from the Doppler profile. A practical implementation of this transform is prese...