310
15 Methodology: Parameterization
Energy (eV)
(b)
A
B
C
D
o
0
5
10
7.5 10.0 12.5 15.0
Φ = 48.5
(d)
A
B
C
D
7.5 10.0 12.5 15.0
0
o
z
(a.u.)
-2.5
-2.5
-2.5
-2.5
Φ = 48.5
A
B
C
D
B
C
D
7.5 10.0 12.5 15.0
7.5 10.0 12.5 15.0
Energy (eV)
z
z 0M
0m
5
0
z 0
-2.5
-2.5
-2.5
-2.5
-3.5
-1.5
o
Φ = 43.5
(a.u)
A
0
(c) z (E)
(a) VLEED spectra
o
Φ = 43.5
I
I0
00
(%)
I
I0
00
(%)
Fig. 15.5 Duplications of the VLEED spectra (a and b) and the corresponding z 0 (E) profiles (c and
d) for models A-D at azimuth angles of 43.5° and 48.5°. Maximal VLEED (= z 0M − z 0m ) that
refers to the region giving a unique solution is obtained near the <11> direction. The spectral fit at
the <11> direction is realized with the tetrahedral M 2 O structure, the 3D-SPB, and the decoding
method. As consequences of the crystal geometry, the z 0 (E) profiles vary with minor change of
atomic geometry. This is exactly what the modeling approach expected. Reprinted with copyright
permission from [10, 11]
15 Methodology: Parameterization
Energy (eV)
(b)
A
B
C
D
o
0
5
10
7.5 10.0 12.5 15.0
Φ = 48.5
(d)
A
B
C
D
7.5 10.0 12.5 15.0
0
o
z
(a.u.)
-2.5
-2.5
-2.5
-2.5
Φ = 48.5
A
B
C
D
B
C
D
7.5 10.0 12.5 15.0
7.5 10.0 12.5 15.0
Energy (eV)
z
z 0M
0m
5
0
z 0
-2.5
-2.5
-2.5
-2.5
-3.5
-1.5
o
Φ = 43.5
(a.u)
A
0
(c) z (E)
(a) VLEED spectra
o
Φ = 43.5
I
I0
00
(%)
I
I0
00
(%)
Fig. 15.5 Duplications of the VLEED spectra (a and b) and the corresponding z 0 (E) profiles (c and
d) for models A-D at azimuth angles of 43.5° and 48.5°. Maximal VLEED (= z 0M − z 0m ) that
refers to the region giving a unique solution is obtained near the <11> direction. The spectral fit at
the <11> direction is realized with the tetrahedral M 2 O structure, the 3D-SPB, and the decoding
method. As consequences of the crystal geometry, the z 0 (E) profiles vary with minor change of
atomic geometry. This is exactly what the modeling approach expected. Reprinted with copyright
permission from [10, 11]