本文探讨了周世勋先生所著《量子力学教程》中一道求氢原子电子动量概率分布的例题，对其求解中标定动量方向

的做法提出了质疑. 对求氢原子量子态的动量概率振幅而言，由于其依赖于动量方向的选取，因此标定动量方向的做法不具

有普适性. 氢原子s 态具有球对称性，其动量概率振幅中的球谐函数与动量方向无关，只有此时动量方向的标定才对概率振幅

的表示没有影响. 对求电子动量的概率分布而言，由于需要对动量的角量进行积分，因此标定动量方向是不妥的.

the probability distribution of the electron momentum in hydrogen atom in quantum mechanics course by Mr. Zhou

shixun is discussed. The method of calibration of momentum direction in the solution is questioned. For calculating

probability amplitude of momentum，the method is not universal since the representation depends on the selection of

momentum direction. Only for the s-states which have spherical symmetry and are independent of momentum direction

since the spherical harmonic function in probability amplitude is independent of momentum direction，this

method has no effect on the representation. Furthermore，for calculating the probability distribution of the electron

momentum，the calculation requires integrating the angular quantity of momentum，it is not appropriate to calibrate

the momentum direction before the calculation.