Spectroscopy of mass-selected transition metal clusters in argon matrices.
Item
-
Title
-
Spectroscopy of mass-selected transition metal clusters in argon matrices.
-
Identifier
-
AAI9707100
-
identifier
-
9707100
-
Creator
-
Haouari, Hanae.
-
Contributor
-
Advisers: Derek M. Lindsay | John R. Lombardi
-
Date
-
1996
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Chemistry, Physical
-
Abstract
-
The chemistry of metal clusters is a fascinating and expanding area of research. During the last three decades, the study of metal clusters and in particular transition metal clusters has been the subject of numerous experimental and theoretical investigations. The desire to understand the frontier between molecular chemistry and solid state physics, as well as gaining new insight into the chemical properties of the metal surfaces used in heterogeneous catalysis are one of the motivations for the extensive work done on metal clusters.;The deposition "soft-landing" of size selected nickel dimer, tantalum dimer, rhodium dimer, ruthenium dimer, zirconium trimer, niobium trimer and tantalum tetramer in solid argon matrices has been done. Neutralized clusters samples deposited on argon matrices were interrogated in-situ by an equivalent of optical absorption referred to as "scattering depletion spectroscopy", and also resonance Raman spectroscopy. The Raman spectra of all above transition metal clusters have been assigned. The information about the geometry, electronic and vibrational structures, dissociation energies and force constants are determined from resonance Raman spectroscopy, absorption and Raman excitation profiles which turned out to be a very useful and fruitful method to assign all the optical transitions involved in each metal clusters. In fact Raman excitation profiles might even be a more sensitive method for obtaining cluster absorption spectra than direct measurements. For instance Raman excitation profiles helped us tremendously assign the optical transitions in both Zr{dollar}\sb3{dollar} and Nb{dollar}\sb3{dollar}.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
