Absorption, and resonance Raman spectroscopy of mass-selected metal clusters in argon matrices.
Item
-
Title
-
Absorption, and resonance Raman spectroscopy of mass-selected metal clusters in argon matrices.
-
Identifier
-
AAI9732905
-
identifier
-
9732905
-
Creator
-
Craig, Robert Dudley.
-
Contributor
-
Advisers: John R. Lombardi | Derek M. Lindsay
-
Date
-
1997
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Chemistry, Analytical | Chemistry, Physical | Chemistry, Inorganic
-
Abstract
-
Resonance Raman spectroscopy has been employed to interrogate mass-selected metal clusters in argon matrices. Previous matrix Raman measurements involved samples which contained a variety of metal clustering species, (such as dimers, trimers, and tetramers, etc.) and resulted in ambiguous to which molecule was the spectral carrier. With the CCNY metal cluster depositon source, metal cluster cations, (produced by argon atom-bombardment) are mass-selected using a Velocity or "Wien" filter, and then co-deposited with excess rare gas on a cold window in the presence of low energy electrons. Neutralized cluster samples are interrogated by absorption, excitation, fluorescence and Raman spectroscopy. We have obtained good quality Raman spectra for many transition metal dimers (V{dollar}\sb2{dollar}, Nb{dollar}\sb2{dollar}, Zr{dollar}\sb2{dollar}, Ta{dollar}\sb2{dollar}, Hf{dollar}\sb2{dollar}, W{dollar}\sb2{dollar}, Re{dollar}\sb2{dollar}, Co{dollar}\sb2{dollar}, Ni{dollar}\sb2{dollar}, Rh{dollar}\sb2{dollar} and Ru{dollar}\sb2{dollar}) as well as higher clustering species (Zr{dollar}\sb3{dollar}, Ta{dollar}\sb4{dollar}, and Nb{dollar}\sb3{dollar}). Vibrational constants for these clusters have been evaluated under conditions where there is no ambiguity to which cluster species is the spectral carrier. These results have provided structural information (force constants, bond energies, geometries, etc.) which have participated in the understanding of the bonding properties (e.g. bond strengths, relative participation of s and d orbital) of small transition metal clusters as a function of position in the periodic table.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
