Abstract
We report the experimental Stark widths of Mn I lines belonging to multiplets z6P°→a6S and z6D°→a6D in long spark induced by laser. We have used aluminum alloy containing 80ppm of manganese as a target to avoid strong self-absorption of Mn I lines. Its absence was proved by the comparison of observed intensities with relative strengths of lines within multiplets. Electron density of plasma estimated by Mg I (5172.68Å) and Al II (2816.18Å) lines was within the range of (4–30)×1016cm−3. The shortest possible gate allowed the observation of symmetric atomic and ionic lines. The spatial profiles of plasma temperature and electron density along the axis of long spark demonstrated that both values were lower than for spherical plasma. Measured Stark widths of resonance multiplet z6P°→a6S decrease from 0.075Å for its first component to 0.055Å for the last one, while Stark widths of components of multiplet z6D°→a6D increase from 0.095Å to 0.125Å. No Stark shifting was observed for the studied multiplets.
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