【摘要】 利用三参数经验公式,研究了自由原子基态单次电离的电子离子碰撞电离截面,在入射电子能量域值和1keV附近,所有的电子离子碰撞电离截面的实验数据和计算结果符合得很好,通常误差小于20%.在靠近域值附近误差为40%,电子离子碰撞电离截面的计算中没有考虑到精细结构的计算.其计算结果可用来模拟激光等离子体的快电子能谱和产额,且可为一些电子仪器的制造提供十分精确的电子碰撞电离截面参数.更多还原

【Abstract】 Using the empirical formula with three free parameters recently proposed,ionization cross section are given for the representation of cross sections for single ionization of free atoms from the ground stages by electron impact.Almost all experimental results can be approximated by this formula with 20% over the whole energy range between threshold and 1 keV.All experimental results can be approximated with experimental error.The formula proposed is not suitable to reproduce the exact contour of fine structure in the ionization cross section curve.The probable error is estimated to be approximately 20%,but near threshold the error is larger than 40% and no fine structures are accounted for.更多还原