18.2 Geometrical Examination
349
Energy (eV)
I
I 0
00
(%)
0
0
4
2
0
6
4
2
0
7.5
12.5 15.0
10.0
7.5
12.5 15.0
10.0
7.5
12.5 15.0
10.0
7.5
12.515.0
10.0
DCu = 0.250 A
x
o
1O2 = 102.0 o
Q 2
1: 0.02
2: 0.04
3: 0.08
(e) Calculated 400L
DCu = 0.250 A
x
o
Q = 0.04
2
1O2 ( )
o
1: 96.0
2: 100.0
3: 102.0
4: 106.0
4
3
2
1
4
2
200
100
50
(b) O-exposure (L)
200
100
50
8
6
4
2
(a) O-exposure (L)
25
35
30
1
2
3
0
0
7.5 10.0 12.5 15.0
7.5 10.0 12.5 15.0
400L
6
4
2
2
4
6
(c) O-exposure (L)
200
400
600
1000
(f) calculated
= 102.0
o
Q = 0.04
x
o
2
1O2
DCu (A)
1: 0.15
2: 0.20
3: 0.25
4: 0.40
1
2
3
4
step 1 & 2
step 3
step 4
35
35
(d) Calculated 400L
Fig. 18.1 Exposure-resolved VLEED spectra (a–c) measured at 70.0° incidence and 42.0° azimuth
from the O-Cu(001) surface, and the calculated results (d–f) from varying individual bond variables.
Variations of intensities in panel (a–c) at 7.1, 9.1 and 10.3 eV show four reaction stages. Calculation
results (d–f) from varying bond variables Q 2 , ∠1O2 and DCu x for 400 L oxygen-exposure provide
the resemblance of the measurements at different stages. (Reprinted with permission from [4])