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Proceedings Paper

Infrared Multiple Photon Dissociation Spectroscopy Of Metal Cluster-Adducts
Author(s): D. M. Cox; A. Kaldor; M. R. Zakin
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Paper Abstract

Recent development of the laser vaporization technique combined with mass-selective detection has made possible new studies of the fundamental chemical and physical properties of unsupported transition metal clusters as a function of the number of constituent atoms. A variety of experimental techniques have been developed in our laboratory to measure ionization threshold energies, magnetic moments, and gas phase reactivity of clusters. However, studies have so far been unable to determine the cluster structure or the chemical state of chemisorbed species on gas phase clusters. The application of infrared multiple photon dissociation IRMPD to obtain the IR absorption properties of metal cluster-adsorbate species in a molecular beam is described here. Specifically using a high power, pulsed CO2 laser as the infrared source, the IRMPD spectrum for methanol chemisorbed on small iron clusters is measured as a function of the number of both iron atoms and methanols in the complex for different methanol isotopes. Both the feasibility and potential utility of IRMPD for characterizing metal cluster-adsorbate interactions are demonstrated. The method is generally applicable to any cluster or cluster-adsorbate system dependent only upon the availability of appropriate high power infrared sources.

Paper Details

Date Published: 1 January 1987
PDF: 4 pages
Proc. SPIE 0742, Laser Applications to Chemical Dynamics, (1 January 1987); doi: 10.1117/12.966913
Show Author Affiliations
D. M. Cox, Exxon Research and Engineering Company (United States)
A. Kaldor, Exxon Research and Engineering Company (United States)
M. R. Zakin, Exxon Research and Engineering Company (United States)


Published in SPIE Proceedings Vol. 0742:
Laser Applications to Chemical Dynamics
Mostafa A. El-Sayed, Editor(s)

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