Photodissociation of Cobalt and Nickel Oxide Cluster Cations

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作者：

CJ Dibble，ST Akin，S Ard，CP Fowler，MA Duncan

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摘要：

Cobalt and nickel oxide cluster cations, CoxOy+ and NixOy+, are produced by laser vaporization of metal rods in a pulsed nozzle cluster 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 O2 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 O2, 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 t...

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关键词：

ab initio calculations antiferromagnetic materials exchange interactions (electron iron compounds molecular dynamics method proteins spin dynamics

DOI：

10.1021/jp302560p

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年份：

2012