Plasma confinement by hemispherical cavity in laser-induced breakdown spectroscopy

L. B. Guo, C. M. Li, W. Hu, Y. S. Zhou, B. Y. Zhang, Z. X. Cai, X. Y. Zeng, Y. F. Lu

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Abstract

An aluminum hemispherical cavity (diameter: 11.1 mm) was used to confine plasmas produced by a KrF excimer laser in air from a steel target with a low concentration manganese in laser-induced breakdown spectroscopy. A significant enhancement (factor >12) in the emission intensity of Mn lines was observed at a laser fluence of 7.8 J/ cm2 when the plasma was confined by the hemispherical cavity, leading to an increase in plasma temperature about 3600 K. The maximum emission enhancement increased with increasing laser fluence. The spatial confinement mechanism was discussed using shock wave theory.

Original languageEnglish (US)
Article number131501
JournalApplied Physics Letters
Volume98
Issue number13
DOIs
Publication statusPublished - Mar 28 2011

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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