PHOTOFRAGMENTATION SPECTROSCOPY OF NIOBIUM CATION CLUSTERS IN A RFFLECTRON TIME-OF-FLIGHT (TOF) MASS SPECTROMETER AND DENSITY FUNCTIONAL CALCULATIONS ON NIOBIUM CATION CLUSTERS
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Date
2000
Authors
Aydin, M.
Lindsay, D. M.
Lombardi, John R.
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The dissociation energies of niobium dimer and tetramer cation clusters are presented. The clusters are produced by laser vaporization of a niobium target rod and cooled in a helium supersonic expansion. The molecular beam containing niobium cation clusters are interrogated in the range $15,400-18,440 cm^{-1}$ using a pulsed dye laser to dissociate the cluster. The dissociation thresholds of the niobium dimer and tetramer cations were determined to be $5.907 \pm 0.056 eV$ and $5.990\pm 0.004 eV$, respectively, in agreement with other experiments.$^{ab}$ Several density functional calculations predicted the dissociation energy of niobium dimer, trimer and tetramer cation clusters and the first ionization energy of $Nb_{2}, Nb_{3}$ and $Nb_{4}$ in remarkable agreement with experiments.
Description
$^{a}$David, A. Hales, Li Lian, and P. B. Arementrout, Int. J. Mass Spect. And Ion Processes, 102, 269 (1990). $^{b}$J. M. W. Chase, C. A. Davies, J. J. R. Downey, D. J. Frurip, R. A. McDonald, and A. N. Syvrud, J. Phys. Chem. Ref. Data Suppl. 14, 1 (1985)
Author Institution: Department of Chemistry and Center For Analysis of Structure and Interfaces (CASI) City College of New York of City, University of New York
Author Institution: Department of Chemistry and Center For Analysis of Structure and Interfaces (CASI) City College of New York of City, University of New York