v E ,n E ) complex. At all the P vE n E
ð Þ terms except P 16 (1), the decay channel to
Ar + I 2 (b) is prevailing (Fig. 6.28). The VP relative probability increases with v E .
It follows from the data given in Fig. 6.26 that there are resonances on some
terms of the progressions and the I 2 (E, D, b, D
0 ) state vibronic levels. They are:
P 0 (1)/b,2; P 5 (0)/D,5; P 5 (4)/D,6; P 6 (4)/D,7; P 8 (0)/d,0; P 11 (1)/E,7; P 12 (1)/E,8;
P 12 (2)/D,13, b,14; P 13 (1)/E,9. The presence of these resonances does not affect the
values of the branching ratios; moreover, resonances do not affect the population of
the ‘resonance’ level of a free iodine molecule. The reason for this ‘phenomenon’ is
explained in the ‘T-shaped HeI 2 (E,v E = 0-17,n E ) complexes’ Sect (see above).
41.0
41.2
41.4
41.6
41.8
42.0
42.2
42.4
42.6
42.8
43.0
6
- -
7
- -
8
- -
9
- -
10
-11
-12
-13
-14
15
16
17
18
19
20
21
22
23
24
25
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0,0
0,1
0,2
0,3
0,4
7,0
8,0
8,1
5,0
5,4
6,0
6,1
6,2
6,3
6,4
11,1
12,1
12,2
13,1
14,1
15,1
16,1
1,0
1,1
1,21.3
1.4 2.0
2.1
2.22.3
2.4 3.0
3.1
3.23.3
3.4 4.0
4.4
4.1
4.24.3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0
1
2
3
4
5
6
7
8
9
10
11
δ
γ
Energy, 10
3
cm
-1
D'
β
D
E
Fig. 6.26 Energies of the I 2 (IP,v IP ,J IP = 5) rovibronic levels of the first-tier iodine molecule IP
states, IP = b, D, E, c, d calculated relative to that of I 2 (X,v X = 0,J X = 4), and the ArI 2 (E,v E = 0-16,
n E ) level energies (shown as horizontal dotted lines). Positions of the progression terms P vE n E
ð Þ
are indicated as v E ,n E (the last column). It is assumed that the ArI 2 (X,0,0) binding energy is
D
X
0 ¼ 240:5 cm
À1 [105]
236
6 Weakly-Bound Complexes and Clusters