Experimental study of space-charge structure and expansion dynamics of laser ablation plasma

The spectrally-selective photorecording with nanosecond time resolution was used to study the distribution of neutral atoms, single- and double charged gallium ions in a plasma plume during laser ablation of a gallium-indium target and the expansion dynamics of these components and the plume as a whole. The expansion velocity of the neutral atomic component of the plume is established. The velocity of expansion of glow boundary is close to 8.5×10³ m/s, the velocity of the shift of maximum of the glow intensity is 6×10³ m/s. The kinetic energy range corresponding to these velocities for gallium atoms (13-26 eV) is in good agreement with the previously measured position of the local maximum on the energy distribution of single-charged gallium ions.

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