Nonstatistical bond breaking in the multiphoton ionization/dissociation of [Fe(CO){sub 5}]{sub m}Ar{sub n} clusters
- Biochemistry and Biophysics Section, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee37831-6125
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, FORTH-IESL, P.O. Box 1527, Heraklion 71110, Crete (Greece)
Photoionization of iron pentacarbonyl/argon clusters with 30 ps, 266 nm laser pulses results in the ultimate detection of iron ions solvated with argon atoms. Clusters such as Fe{sub m}{sup +}Ar{sub n} (m=1,2; n=1{endash}26) are readily observed following the laser-induced decarbonylation of the [Fe(CO){sub 5}]{sub m}Ar{sub n} species formed in the supersonic jet. An interesting intensity alternation of the Fe{sup +}Ar{sub n} ions is observed up to a magic number at n=6, after which a monotonically decreasing intensity pattern is noted. The pattern is similar to a more extensive spectrum (with additional magic numbers) observed in separate experiments where metallic iron is laser ablated into a supersonic flow of argon, krypton, or xenon, and the resulting cluster ions are detected in a reflectron mass spectrometer. In another experiment in the latter apparatus, the sputtering of iron into a mixture of carbon monoxide and argon shows the relative reactivity of Fe{sup +} to form Fe{sup +}Ar{sub n} and Fe{sup +}(CO){sub n} ions. Mechanisms for the energy disposal during the ionization/dissociation process are discussed. Additionally, the intensity pattern of iron{endash}rare gas clusters, Fe{sup +}(RG){sub n}, is discussed in the context of structural arguments which have previously been applied successfully to a large number of metal{endash}rare gas systems. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 625392
- Journal Information:
- Journal of Chemical Physics, Vol. 108, Issue 15; Other Information: PBD: Apr 1998
- Country of Publication:
- United States
- Language:
- English
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