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An experimental study has been carried out on the dynamical process taking place in the secondary plasma generated by a Q-switched Nd:YAG laser (80 mJ, 8 ns) on a copper target at reduced pressure. Accurate
dynamical characterization of the cross-sectional view of the plasma has been made possible by the unique combination of a plasma confinement configuration and the time-resolved measurement technique. In
addition to reaffirming the role of the blast-wave mechanism in the generation of secondary plasma, an analysis of the time-resolved spatial distributions of emission intensities and the time-resolved spatial
distributions of temperature was made. As a result, the occurrence of two-stage emission processes, the "shock excitation stage" and "cooling stage," has been proved. For instance, at
2 Torr it is shown that the emission process is initiated by a brief shock excitation process (~1 mu s) and followed by a longer cooling process (~3 mu s). The experimental results concerning the characteristics
of the plasma can be well understood by considering the two-stage processes.
The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)