Photodissociation of Cobalt and Nickel Oxide Cluster Cations

被引：35

作者：

Dibble, C. J. ^{[1
]}

Akin, S. T. ^{[1
]}

Ard, S. ^{[1
]}

Fowler, C. P. ^{[1
]}

Duncan, M. A. ^{[1
]}

机构：

[1] Univ Georgia, Dept Chem, Athens, GA 30602 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2012年 / 116卷 / 22期

关键词：

GUIDED ION-BEAM; DENSITY-FUNCTIONAL CALCULATIONS; NEUTRAL VANADIUM-OXIDE; GAS-PHASE REACTIONS; IR MATRIX-ISOLATION; NM SINGLE-PHOTON; PHOTOELECTRON-SPECTROSCOPY; ELECTRONIC-STRUCTURE; METALLO-CARBOHEDRENES; INFRARED-SPECTRA;

D O I：

10.1021/jp302560p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Cobalt and nickel oxide cluster cations, CoxOy+ and NixOy+, are produced by laser vaporization of metal rods in a pulsed nozzle duster source and detected using time-of-flight mass spectrometry. The mass spectra show prominent stoichiometries of x = y for CoxOy+ along with x = y and x = y - 1 for NixOy+. The cluster cations are mass selected and multiphoton photodissociated using the third harmonic (355 nm) of a Nd:YAG laser. Although various channels are observed, photofragmentation exhibits two main forms of dissociation processes in each system. CoxOy+ dissociates preferentially through the loss of O-2 and the formation of cobalt oxide clusters with a 1:1 stoichiometry. The Co4O4+ cluster seems to be particularly stable. NixOy+ fragments reveal a similar loss of O-2, although they are found to favor metal-rich fragments with stoichiometries of NixOx-1. The Ni2O+ fragment is produced from many parent ions. The patterns in fragmentation here are not nearly as strong as those seen for early or mid-period transition-metal oxides studied previously.

引用

页码：5398 / 5404

页数：7

共 113 条

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