摘要:
利用瑞利散射法可以对团簇的尺寸以及团簇形成的演变过程进行研究,这种方法非常简单易行且对团簇是非破坏性的.通过对纯氙气以及氢氙混合气体形成的团簇的瑞利散射进行测量,研究并分析了瑞利散射强度随时间、初始背压以及气体混合比例的变化,由此估算了在不同情况下形成团簇的平均尺寸.通过获得的氢氙混合气体瑞利散射强度与背压的关系I =(1.5×10?5)P 6.47,发现了混合气体中氢气对氙团簇形成的促进作用,并从热力学和分子间作用力的角度进行了理论分析,得到了氢氙混合气体不易于液化这一新现象,为实现高背压下更大尺寸团簇的产生提供了可能.所获得的结果为今后基于氙团簇的X射线产生实验,以及基于氘氙混合气体的中子产生实验研究提供了良好的实验依据.
Abstract:
Rayleigh scattering method can be used to investigate the cluster size and the cluster formation process, and its advantages are that it is easy to perform and non-disruptive. In this paper, by measuring the Rayleigh scattering inten-sities of clusters generated respectively in pure xenon gas and hydrogen-xenon gas mixture, the relationships of Rayleigh scattering intensity to time, backing pressure, and mixture ratio are studied, and according to these relationships, the average sizes of clusters under different conditions are estimated. Through the scaling law of the Rayleigh scattering intensity obtained in hydrogen-xenon gas mixture with respect to upstream gas pressure, i.e., I =(1.5 × 10?5)P 6.47, the hydrogen of mixed gas is found to be conducible to the generating of xenon clusters. The advantages of hydrogen-xenon gas mixture for generating clusters are analyzed theoretically from the perspective of thermodynamics and intermolecular forces, and a new phenomenon, i.e., the hydrogen xenon gas mixture is not easy to liquefy, is found. This finding provides a new way to generate larger size clusters. Our results are expected to provide guidelines for the future experimental researches of the X-ray generated by xenon clusters and of the neutron generated by the deuterium-xenon mixture gas.
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