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Schematic diagram of the experimental setup for optical emission spectroscopy.
Time-integrated LIBS spectra of Al target with (solid curve) and without (short dotted curve) the presence of walls.
Emission intensity for Al atomic lines (Al I with ) as a function of the time delay. The distances between the walls are (a) , (b) , (c) , and (d) , respectively.
Maximum enhancement factor and the time delay for the maximum enhancement as functions of the wall distance.
Fast images of laser-induced Al plasmas with (bottom row) and without (top row) the presence of the walls.
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