Atmospheric Influences on Q-Switched Laser Sampling and Resulting Plumes:
作者： E. H. Piepmeier , D. E. Osten
DOI: 10.1366/000370271779951039
关键词: Laser 、 Atmospheric-pressure plasma 、 Analytical chemistry 、 Torr 、 Impact crater 、 Spectral line 、 Ambient pressure 、 Chemistry 、 Atomic physics 、 Q-switching 、 Emission spectrum
摘要: When a 10–100-mJ single-spike Q-switched Nd laser pulse is focused on copper sample, the presence of an atmosphere affects spectra, crater size, and amount sample vaporized. At 760 Torr diameter (90 μ) vaporized (35 ng) remain relatively constant while at 1 they both increase with increasing energy. Spatial changes in spectra occur ambient pressure. The continuum intensity limited region just above surface appears to be better measure energy reaching than does beam. experimental results appear caused by absorption large fraction atmospheric plasma. A radiation-supported shock-wave model evaluated detail compared briefly similar models as possible mechanisms for production analytical chemical implications theoretical are discussed.
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