Consider that the electron approximately surrounds the atomic nucleus,the Hamilton operator can be simplified as 、 +n 2m。 = 方2 2 2m。x+ n-e Ze2 e n-e 4π8o' r=vx2+y2+22 The Schrodinger equation Hy =Ew Separation of variablese n e e e n e V m H  T V       ˆ 2 ˆ ˆ ˆ 2 2  r Ze Vn e 0 2 4 ˆ     Consider that the electron approximately surrounds the atomic nucleus, the Hamilton operator can be simplified as r e 2 2 2 r  x  y  z 2 n-e 2 2 2 2 2 e 2 V ˆ ) x y z ( 2m H - ˆ            Separation of variables ? The Schrödinger equation Hˆ  E