同步辐射反射法测定液体结构方法研究

A method for X-ray measurement of liquid structure by reflection of synchrotron radiation

用北京同步辐射装置4W1C光束线Huber五圆测角仪反射法测定液体结构的实验方法。以Na2SO4溶液的散射实验为例,简单介绍了样品池构造、散射几何布局、样品准直、扫描条件和扫描方式;详尽叙述了实验散射强度数据的校正方法,如样品池窗口净吸收、空气散射、偏振校正、吸收校正和几何校正等;演示了溶液结构函数和径向分布函数的计算方法,包括Compton散射强度和乱真峰的扣除技巧。研究表明,用同步辐射反射法获得了高质量的X射线散射数据。

An experimental method is reported in this paper for X-ray measuringement of liquid structure by X-ray reflection of from flat specimen cell with a the five-circle goniometer in of the 4W1C beamline of Beijing Synchrotron Radiation Facility （BSRF I） was reported in the paper. Taking the scattering measurement of an aqueous solution of sodium sulfate for as an example, construction of liquid cell, scattering geometrical arrangement, sample alignment, and scanning mode were briefly introduced. Corrections of the measured scattering intensity for such as net absorption of beryllium window, air scattering, synchrotron radiation polarization, sample absorption and geometrical factor, etc. were described in detail. Calculation procedures of liquid structural function and radial distribution function, including removal of Compton scattering and spurious peak, were demonstrated. The result shows that high quality X-ray scattering data can be obtained by the X-ray reflection method.