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Fisika-Kuantum

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Jika fungsi-fungsi {ϕ n (x)} selain ternormalisasi juga ortogonal (disebut ortonormal)<br />

satu sama lain maka berlaku<br />

∞<br />

∫ ϕ *<br />

m<br />

( x)<br />

ϕ<br />

n<br />

( x)<br />

dx =<br />

−∞<br />

δ<br />

mn<br />

=1; m=n<br />

=0; lainnya<br />

Jika ψ(x) fungsi yang dinormalisasi, maka<br />

δ disebut kronecker delta<br />

Jadi,<br />

∞<br />

∫<br />

−∞<br />

ψ<br />

*<br />

(<br />

*<br />

∑c n<br />

c n<br />

n<br />

x)<br />

ψ(<br />

x)<br />

dx<br />

= 1<br />

= 1<br />

∑<br />

m,<br />

n<br />

c<br />

*<br />

m<br />

c<br />

∞ n ∫<br />

−∞<br />

φ<br />

*<br />

m<br />

( x)<br />

φ<br />

n<br />

( x)<br />

dx = 1<br />

∑<br />

m,<br />

n<br />

c<br />

*<br />

m<br />

c<br />

n<br />

δ<br />

mn<br />

= 1<br />

Untuk memudahkan penulisan, fungsi-fungsi dituliskan dalam ket seperti<br />

dan konjugasinya dalam bra seperti<br />

φ n<br />

φ n<br />

Integral overlap dituliskan seperti:<br />

∞<br />

∫ ϕ *<br />

k<br />

( x)<br />

ϕl<br />

( x)<br />

dx =<br />

−∞<br />

ϕ<br />

k<br />

ϕ<br />

l<br />

20

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