期刊
ANALYTICAL CHEMISTRY
卷 85, 期 9, 页码 4507-4511出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac400072j
关键词
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资金
- Natural Science Foundation of China Financial [20775063, 21027011]
- Research Fund for the Doctoral Program of Higher Education of China [20120121110011]
- NFFTBS [J1210014]
Matrix effect is unavoidable in direct solid analysis, which usually is a leading cause of the non-stoichiometric effect in quantitative analysis. In this research, experiments were carried out to study the overall characteristics of atomization and ionization in laser-solid interaction. Both nanosecond (ns) and femtosecond (fs) lasers were applied in a buffer-gas-assisted ionization source coupled with an orthogonal time-of-flight mass spectrometer. Twenty-nine solid standards of ten different matrices, including six metals and four dielectrics, were analyzed. The results indicate that the fs-laser mode offers more stable relative sensitivity coefficients (RSCs) with irradiance higher than 7 x 10(13) W.cm(-2), which could be more reliable in the determination of element composition of solids. The matrix effect is reduced by half when the fs-laser is employed, owing to the fact that the fs-laser ablation and ionization (fs-LAI) incurs an almost heat-free ablation process and creates a dense plasma for the stable ionization.
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