这周过得好累喔
课程依然还是有时会有时很迷茫
虽然老师很佛心
但还是想要弄懂R
早上越来越冷了
然后就越来越起不来惹
期末考暂定在早八
好怕万一睡过头就掰掰惹
week 12
Electron spin and the Pauli principle
1.spin:classical concept is wrong !
2.electron spin:
(1)not cassical effect
(2)relativistic quamtum mechanics,proposed by Dirac.
3.In nonrelativistic QM,spin is introduced as hypothesis.
4.spin angular mamentum operator:
[Sx,Sy]=i(h-bar)Sz
[S^2,Sy]=0