Photodissociation of mass-selected Bi/Cr and Bi/Fe bimetallic clusters

Bi/Cr and Bi/Fe bimetallic clusters are produced in a pulsed nozzle cluster source by laser vaporization of solid bismuth and coincident photolysis of Fe or Cr carbonyl vapor. Neutral clusters are photoionized at 193 nm with an ArF excimer laser in a reflectron time-of-flight mass spectrometer. The...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1990-10, Vol.94 (21), p.8016-8019
Main Authors: TAYLOR, T. G, WILLEY, K. F, BISHOP, M. B, DUNCAN, M. A
Format: Article
Language:English
Subjects:
02 PETROLEUM
020400 - Petroleum- Processing
Analytical chemistry
BIMETALS
BISMUTH
CARBONYLS
CATALYSTS
CHEMICAL REACTIONS
Chemistry
CHROMIUM
DISSOCIATION
ELEMENTS
Exact sciences and technology
IRON
MASS SPECTROSCOPY
METALS
PHOTOCHEMICAL REACTIONS
SOLID CLUSTERS
Spectrometric and optical methods
SPECTROSCOPY
TRANSITION ELEMENTS
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Summary:Bi/Cr and Bi/Fe bimetallic clusters are produced in a pulsed nozzle cluster source by laser vaporization of solid bismuth and coincident photolysis of Fe or Cr carbonyl vapor. Neutral clusters are photoionized at 193 nm with an ArF excimer laser in a reflectron time-of-flight mass spectrometer. The resulting cations are mass-selected and photodissociated at various ultraviolet wavelengths. Photodissociation channels indicate that heteronuclear Bi--transition metal bonding is comparable energetically to corresponding homonuclear interactions in these systems. Lower limits on dissociation energies (D sub 0 ") are obtained for Bi--Fe (= > 1.85 eV), Bi exp + --Fe (= > 1.85 eV), Bi--Cr (= > 2.58 eV), and Bi--Cr exp + (= > 2.06 eV). Spectra. 20 ref.--AA
ISSN:0022-3654
1541-5740
DOI:10.1021/j100384a007