Considering the space cycle of magnetostatic field is only 7.8 nm, the precise wavelength calculation and the precise radiating power calculation should consider the reaction propulsion of electron. 考虑到静磁场的空间周期只有7.8nm,要精确计算电子在多层膜摇摆器中运动的自发辐射的波长和辐射功率就必须考虑电子的反冲。