The pump-probe technique was utilized for study VP of the NeICl(A,v A = 23)
vibronic state lying near the ICl(A dissociationlimit. It was shown that Dv A = 1, 2
channels open. The rotational distribution of the ICl(A,22) vibronic state is narrow,
J A = 1-8, whereas that of ICl(A,21) is wide, rotational levels with up to 69 cm
−1
energy are populated. The NeICl(A,v A = 23) VP lifetime is 2.3
s
50 ps [119].
The NeI
35 Cl(IP) complexes were studied in [34–36] in detail. The binding energy
of the NeI
35 Cl(E,v E = 1) complex is equal to 87.6(8) cm
−1 , and those in the NeI
35 Cl
(A, v A = 10–25) complex are (45–42) cm
−1 . The NeI
35
Cl(E,0,n
str
E ¼ 0 À 3 ← A,11,
n A ) progression, x
E
e ¼ 52:5 1
ð Þ cm
À1 , ðx e x e Þ
E ¼ 6:14 4
ð Þ cm
À1 , is observed in [34].
T.A. Stephenson et al. studied decay of the NeICl(IP,v IP = 0-4), IP = E0
+
, D
0 2,
b1 complexes using a pump-probe optical population via the NeICl(A,v A = 14, 15)
intermediate states [36]. The principal features observe are as follows:
The luminescence which can be described as the ICl(D
0
! A
0 and E ! X)
transitions was observed in the energy range where the NeICl(IP,v IP = 0) decay is
energetically closed. The authors of [36] ascribed it to the NeICl(IP,v IP = 0)
complex itself.
There is no NeICl(IP,v IP = 1-4) luminescence due to fast complex VP, and the
ICl(D
0
! A
0 , b ! A and E ! X) transitions occur. T.A. Stephenson et al. [36]
believed that this feature is due to D
0 , b and E mutual perturbation induce by
presence of Ne atoms.
In the author’s opinion, the NeICl(b1 ← A) transition is the most probable, and
then ICl(D
0 and E) state are populated in the NeICl(b1) EP.
The ArICl complexes. Data on some spectroscopic characteristics of the ArI
35 Cl
(X,v X = 0) complexes are given in Table 6.10. Some spectroscopic characteristics of
the ArICl(X0
+
, A1, D
0 2, b1, E0
+
) states and the decay of the complex IP states have
been studied in [120]. The binding energies of the ArICl(X,0 and A,v A = 12-15)
states are
213.4 cm
−1 , and (208.3– 205.7) cm
−1 , respectively. The binding
energies of the ArICl(b,0) state is larger, 452.7 cm
−1 . Luminescence of the ArICl
(b1, E0
+
) and, maybe, ArICl(D
0 2) complexes themselves have been observed and
studied. The radiative lifetime of the ArICl(E,0) state is equal to 23 ns, like those of
ICl(b1, E0
+
).
The RglBr complexes. As far as the author knows, there are no data on electronically excited HeIBr and ArIBr state in the literature. The NeIBr(A) vdW
complexes were observed and studied, only [121, 122]. The binding energy of the
NeIBr(X,v A = 0) and NeIBr(A,v A = 16) complexes is 71.8 ± 1.2 and 65.5 ± 1.2,
units, cm
−1 , respectively [122], and NeIBr(A,v A ) VP lifetime decreases from 23 ps
(v A = 12) to 3 ps (v A = 19) [122].
6.3.4 Molecule-I 2 vdW Complexes
There are several papers in which results of studies of the molecule-X 2 vdW
complexes have been reported.
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6 Weakly-Bound Complexes and Clusters
vibronic state lying near the ICl(A dissociationlimit. It was shown that Dv A = 1, 2
channels open. The rotational distribution of the ICl(A,22) vibronic state is narrow,
J A = 1-8, whereas that of ICl(A,21) is wide, rotational levels with up to 69 cm
−1
energy are populated. The NeICl(A,v A = 23) VP lifetime is 2.3
s
50 ps [119].
The NeI
35 Cl(IP) complexes were studied in [34–36] in detail. The binding energy
of the NeI
35 Cl(E,v E = 1) complex is equal to 87.6(8) cm
−1 , and those in the NeI
35 Cl
(A, v A = 10–25) complex are (45–42) cm
−1 . The NeI
35
Cl(E,0,n
str
E ¼ 0 À 3 ← A,11,
n A ) progression, x
E
e ¼ 52:5 1
ð Þ cm
À1 , ðx e x e Þ
E ¼ 6:14 4
ð Þ cm
À1 , is observed in [34].
T.A. Stephenson et al. studied decay of the NeICl(IP,v IP = 0-4), IP = E0
+
, D
0 2,
b1 complexes using a pump-probe optical population via the NeICl(A,v A = 14, 15)
intermediate states [36]. The principal features observe are as follows:
The luminescence which can be described as the ICl(D
0
! A
0 and E ! X)
transitions was observed in the energy range where the NeICl(IP,v IP = 0) decay is
energetically closed. The authors of [36] ascribed it to the NeICl(IP,v IP = 0)
complex itself.
There is no NeICl(IP,v IP = 1-4) luminescence due to fast complex VP, and the
ICl(D
0
! A
0 , b ! A and E ! X) transitions occur. T.A. Stephenson et al. [36]
believed that this feature is due to D
0 , b and E mutual perturbation induce by
presence of Ne atoms.
In the author’s opinion, the NeICl(b1 ← A) transition is the most probable, and
then ICl(D
0 and E) state are populated in the NeICl(b1) EP.
The ArICl complexes. Data on some spectroscopic characteristics of the ArI
35 Cl
(X,v X = 0) complexes are given in Table 6.10. Some spectroscopic characteristics of
the ArICl(X0
+
, A1, D
0 2, b1, E0
+
) states and the decay of the complex IP states have
been studied in [120]. The binding energies of the ArICl(X,0 and A,v A = 12-15)
states are
213.4 cm
−1 , and (208.3– 205.7) cm
−1 , respectively. The binding
energies of the ArICl(b,0) state is larger, 452.7 cm
−1 . Luminescence of the ArICl
(b1, E0
+
) and, maybe, ArICl(D
0 2) complexes themselves have been observed and
studied. The radiative lifetime of the ArICl(E,0) state is equal to 23 ns, like those of
ICl(b1, E0
+
).
The RglBr complexes. As far as the author knows, there are no data on electronically excited HeIBr and ArIBr state in the literature. The NeIBr(A) vdW
complexes were observed and studied, only [121, 122]. The binding energy of the
NeIBr(X,v A = 0) and NeIBr(A,v A = 16) complexes is 71.8 ± 1.2 and 65.5 ± 1.2,
units, cm
−1 , respectively [122], and NeIBr(A,v A ) VP lifetime decreases from 23 ps
(v A = 12) to 3 ps (v A = 19) [122].
6.3.4 Molecule-I 2 vdW Complexes
There are several papers in which results of studies of the molecule-X 2 vdW
complexes have been reported.
246
6 Weakly-Bound Complexes and Clusters