software to fit optical spectra - Quantum Materials Group

“Rs” Grazingincidence
reflectivity (spolarization)
“Rps” Ratio between
Rp and Rs
“E1” The real part of
the dielectric
function
“E2” The imaginary
part of the
dielectric
function
R s R α
R
s
average
, where
N
∑ wi
average =
i=
0
N
∑
i=
1
R (θ )
1 ⎛ i − N / 2 ⎞
wi = , θ i = θ⎜1
+ sd ⎟ ,
N + 1 ⎝ N ⎠
( N = 10 ),
2
R ( ) = r ( θ )
r s
s θ s
cosθ
−
( θ ) =
cosθ
+
R ps
R
ps
average
, where
Guide to RefFIT Page 58
s
w
N
∑ wi
average
=
i=
0
N
i
i
ε − sin
ε − sin
R
∑
i=
1
ps
w
i
2
2
i
,
θ
θ
(θ )
1 ⎛ i − N / 2 ⎞
wi = , θ i = θ⎜1
+ sd ⎟ ,
N + 1 ⎝ N ⎠
( N = 10 ),
2
R ( ) = r ( θ )
r
ps θ ps
ps
r
( θ ) =
r
“S1” The real part of
the optical
conductivity in
practical units
π
σ 1 ×
15
“S2” The imaginary
part of the
π
σ 2 ×
15
p
s
2
2
sin θ − cosθ
ε − sin θ
=
2
2
sin θ + cosθ
ε − sin θ
,
- angle of
incidence
(θ ), angle
spread ( s θ ),
scaling factor
of R ( α R )
- angle of
incidence
(θ ), angle
spread ( s θ )
ε - -
1
ε - -
2
Ω -1 cm -1 -
Ω -1 cm -1 -