這週過得好累喔
課程依然還是有時會有時很迷茫
雖然老師很佛心
但還是想要弄懂R
早上越來越冷了
然後就越來越起不來惹
期末考暫定在早八
好怕萬一睡過頭就掰掰惹
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
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