Chemistry Reference
In-Depth Information
Table 3 (continued)
Au
n
z
(
n
)
Method
Key observation(s)
References
Au
n
+
14-24
PD
Determination of dissociation energies
[
184
]
Au
n
EID
Production of dianionic and trianionic
clusters
[
199
,
200
]
Au
n
Threshold for production of Au
25
2
is
determined
25
EID
[
201
]
Au
n
7
PD
Photodissociation with a green laser
pointer shows decay into Au
6
and
Au
5
[
185
]
Au
n
2
29
PD
Decay observed by PD
[
185
]
Au
n
+
9, 11, 13, 15
PD
Determination of dissociation energy via
dimer evaporation
[
186
]
Au
n
+
17-21
PD
Excitation energies far above the clusters
dissociation thresholds have been used
to induce multisequential fragmenta-
tion by the evaporation of neutral
monomers
[
187
]
Au
n
11-40
51-70
Low-energy
electrons
Production of dianions and trianions
[
188
]
Au
n
+
3-21
PD
Fragmentation pathways monitored as a
function of cluster size. Monomer and
dimer evaporation
[
189
]
Au
n
+
5, 8, 12
PD
Isomers can be distinguished by their dis-
tinct decay rates
[
190
]
Au
n
+
30
PD
The determination of relative dissociation
energies
[
191
]
Au
n
+
7-27
PD
The monomer-dimer branching ratios as a
function of the excitation energy and
dissociation energy were determined
[
192
]
Au
n
2
29
PD
Dissociation products determined
[
193
]
Au
n
14, 17
PD
Study of decay rates for cluster anions
[
194
]
Au
n
2
35, 40, 45, 50
PD
Photoexcited gold cluster dianions
resulted in neutral atom evaporation
(Eq. (
7
),
z
¼
[
195
]
2) and electron emis-
sion (Eq. (
9
),
z
¼
2)
Au
n
2
21-31
CID
Singly charged clusters have been
observed at low collision energy,
indicating the emission of one electron
Eq. (
9
)
[
178
]
n
1-4) were observed, with no core fission occurring under these low-energy
collision conditions. These results highlight the relative structural stability of
the Au
20
core, which was predicted from theoretical calculations
¼
to be
tetrahedral [
203
].
The CID of bisphosphine-protected gold nanoclusters where the protecting
ligand was Ph
2
P-(CH
2
)
n
-PPh
2
(
n
¼
1-6) has been studied (Sect.
2.5
above). This
