https://doi.org/10.1007/s100530170239
Binding energies of first and second shell water molecules in the Fe(H2O)2+, Co(H2O)2+ and Au(H2O)2+ cluster ions
Laboratoire Francis Perrin (CNRS FRE 2298) ,
CEA/DRECAM/Service des Photons, Atomes et Molécules
C.E. Saclay, 91191
Gif-sur-Yvette Cedex, France
Corresponding author: a jmm@drecam.saclay.cea.fr
Received:
22
September
2000
Revised:
8
December
2000
Published online: 15 April 2001
The fragmentation cross-section of the
Fe(H2O)
, Co(H2O) and
Au(H2O) ions were measured, as a function of the
collision energy. Threshold energies of 
eV, eVand 
eVwere
measured for the monohydrated 
, 
and 
ions respectively, in fair agreement with the existing
literature. Small threshold energies of 
eV, eVand 
eV
were found for the Fe(H2O)
, Co(H2O) and Au(H2O)
clusters respectively. Secondary thresholds were observed on the
cross-section, respectively at 
eV and 
eV for the
Co(H2O) and Au(H2O) clusters. This double threshold
behavior could be attributed to the presence of two kinds of
isomers in the beam. The upper threshold is associated with clusters
where both water molecules are linked to the metal ion (first
solvation shell), whereas the lower threshold corresponds to
clusters with one water molecule in the first solvation shell and
the other in the second shell. Such an analysis documents the
binding energy of either a first shell or a second shell water
molecule in the M(H2O) cluster ions.
PACS: 36.40.Mr – Spectroscopy and geometrical structure of clusters / 36.40.Qv – Stability and fragmentation of clusters
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
