期刊
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
卷 228, 期 2-3, 页码 285-295出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1387-3806(03)00215-X
关键词
metal dications; photodissociation; metastable cluster ions; metal ion solvation
Doubly charged metal ion complexes of the form M2+ (L)(n) are generated using a laser vaporization cluster source in conjunction with a time-of-flight mass spectrometer. Contrary to expectations, a variety of doubly charged species are produced with this source, including many so-called unstable or metastable ions in which the metal has a second ionization potential greater than the first ionization potential of the ligand or solvent. The species identified include Mg2+(CO2)(n), Mg2+(H2O), Mg2+(Ar)(n), Co2+(Ar)(n), Co2+(H2O), Si2+(Ar)(n) and Ti2+(CO2)(n). This is apparently the first observation by any means of Co2+(Ar)(n), Ti2+(CO2)(n) and Si2+(Ar)(n). Of the complexes studied, only the stable species Mg2+(Ar)(n) have been generated previously by laser vaporization. The conditions necessary for the production of these ions are investigated and possible mechanisms for their growth are suggested. Charge-transfer photodissociation is observed for. Co2+(Ar) complexes. (C) 2003 Elsevier Science B.V All rights reserved.
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