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本文提供一个消除仪器的时间分辨函数影响作多指数函数拟合计算正电子湮没寿命谱程序(NFIX ED),其源程序是美国乔治亚大学徐孝华教授赠送的。这个程序只有一个主程序,无子程序,结构简单,适合用小型计算机处理数据。程序流程中,根据不固定或固定(寿命和强度)成分的需要分十二种情况进行处理,由指示变量(J_6)来选择,变化灵活,效果显著。又使用解行列式的方法求修正参变量,进行迭代运算,避免了解方程的复杂程序设计。用此程序要注意以下几点:
This article provides a procedure to eliminate the influence of time-resolved functions of instruments on multi-exponential function fitting for the calculation of the positron annihilation lifetime spectrum program (NFIX ED), the source of which was presented by Professor Xu Xiaohua of the University of Georgia. This program has only one main program, no subroutine, simple structure, suitable for processing data with a small computer. Program flow, according to the need for fixed or fixed (life and strength) components in twelve cases to deal with, by the indicator variable (J_6) to choose, flexible change, the effect is significant. Also use the method of solving determinants of positive reference variables, the iterative operation, to avoid understanding the complex programming equations. Use this procedure should pay attention to the following points: