瑞利散射法诊断大尺寸团簇

瑞利散射法的优点是实验易行，对于团簇是非破坏性的。利用这种方法Ａ．Ｊ．Ｂｅｌｌ等人测出了尺寸在１５０－４０００的氩团簇。Ｒ．Ｋｌｉｎｇｅｌｈｏｅｆｅｒ测量瑞用射信号强度同散射角的依赖关系，推断以团族尺寸分布。Ｔ．Ｄｉｔｍｉｒｅ等在散射角固定不变的情况下，测量散射信号同气体滞止压强Ｐ０或温度Ｔ０的关系，从而推断团簇的尺寸。

Diagnoses of Large Clusters by Rayleigh Scattering

Rayleigh scattering method is a light scattering method ,the advantage of which is its easiness to perform and non disruptive. With this method ,Ar clusters in the range of 150 to 4000 were detected by A.J.Bell et al.,R.Klingelhofer et al. also detected the angular dependence of scattering intensity and the resulted cluster size distribution. The stagnation pressure P 0 and temperature T 0 dependence of scattering signals is studied by T.Ditmire et al.. The size of clusters produced under different conditions was diagnosed. For H 2 at 79 K and Ar at 293 K,Rayleigh scattering signals scale as ≈P 3.8 0 and P 3.6 0,respectively gave the peak cluster size N c of ≈690 and 1160. For cooled Ar at 147 K,it was found an initial pressure scaling ≈P 3.8 0 below 35 kTorr and a more rapid scaling of ≈P 4.3 0,whose peak implies a cluster size of ≈3.5×10 4.