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PauliPauli
Wolfgang Pauli(1900-1958)
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Pauli and EinsteinPauli and Einstein
“I will never forget the speech about me, and for me, that he gave at Princeton in 1945 after I got the Nobel Prize. It was like the abdication of a king, installing me as a kind of elected son, as his successor," Wolfgang Pauli reminisced in a 1955 letter to Max Born.The "king" was, of course, the 66-year-old Einstein. His realm was physics and Pauli was his appointed heir. The occasion was a banquet in Princeton honoring Pauli, who had been awarded the prize for his discovery of the exclusion principle. In 1969,eleven years after Pauli's death, Born commented, "Since the time when he was my assistant in Göttingen, I knew he was a genius, comparable only to Einstein himself. As a scientist he was, perhaps, even greater than Einstein. But he was a completely different type of man, who, in my eyes, did not attain Einstein's greatness."
http://www.aip.org/pt/vol-54/iss-2/p43.html
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Fig. 9-14, p.313
Distinguishable and Indistinguishable Particles
Distinguishable and Indistinguishable Particles
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Exchange SymmetryExchange Symmetry
bosons (예: photons)
( ) ( )
( ) ( )
( ) ( )
2 21 2 2 1
1 2 2 1
1 2 2 1
, ,
, ,
, ,
ψ ψ
ψ ψ
ψ ψ
=
=
= −
r r r r
r r r r
r r r r fermions (예: electrons)
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Example: He AtomExample: He Atom
( ) ( )( ) ( ) ( ) ( )( ) ( ) ( )
( ) ( ) ( )
( ) ( ) ( ) ( )( ) ( ) ( ) ( )
[ ] ( ) ( ) ( ) ( ) ( )
( ) ( ) ( ) ( ) ( )
2 22 21 1 2 1 2 2 1 2 1 2 2 1
1 2
1 2 1 2 1 2
1 2 1 2
1 2 1 2
1 2 1 2
1 2 1 2 2 1
2 2, , , , ,
2 2(1) , (2) , ,
(1)
(2)
(1) (2)
,
e e
a b a a b
a b b a b
a b a b a b
ab a b a b
a
e e e ek k E
m r m rh h E
h E
h E
h h E E
ψ ψ ψ ψ ψ
ψ ψ ψ
ψ ψ ψ ψ
ψ ψ ψ ψ
ψ ψ ψ ψ
ψ ψ ψ ψ ψ
ψ
− −− ∇ + − ∇ + =
+ =
=
=
+ = +
= −
r r r r r r r r r r
r r r r r r
r r r r
r r r r
r r r r
r r r r r r
( ) ( ) ( ) ( ) ( ) ( )
( )
2 1 2 1 1 2 1 2
1 2
, ,
, 0
b a b a b ab
aa
ψ ψ ψ ψ ψ
ψ
= − = −
=
r r r r r r r r
r r Pauli’s exclusion principle(No two electrons in an atom an have the same set of quantum numbers.)
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Fig. 9-15, p.321
Exclusion Principle and Hund’s RuleExclusion Principle and Hund’s Rule
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MendeleevMendeleev
Dimitri Ivanovitch Mendeleev (1834-1907)
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Table 9-2a, p.322
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Table 9-2b, p.323
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Fig. 9-16, p.324
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