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)5(
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4
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ˆ
dE
Er
gE
gE
dE Er Ert
gE
gE
rgt
dE d m
l
Y Er
gE
g
E
gE
gE
dEEr
ml
r
gml
dEEr
gE
gE
dE dE Er E Erls
gE
gE
gE
gE
rg gls
l
l
l m
m
l
Y
G
g
r
gml
rg gls
rg scat
q
pr r
P
p
gpq
g scat q
rg gt
rg
−
−
=
−
−
=
=
−
→
−
−
= −
=
−=
=
−
=
−
=
+
= +
The method
➢
Energy is divided in g=1,..,
G groups
of width ΔE
g
so that energy decreases as group
order decreases
Our equations
become: