Temporal evolution spectroscopic investigation of metal hydride compound induced by pulsed laser

Optical emission of the plasma generated on metal hydride target by pulsed laser beam from an Nd:YAG laser was used to investigate the temporal evolution of the line relative intensity, ion (electron) temperature (Te) and electron density (Ne). From relative emission intensities of the atomic and ionic species, the ion temperature using Saha- Boltzmann plots were evaluated. The electron density was determined utilizing the Stark broadening of the Hα-line at 656.27 nm. It was found that numerous lines of double-charged metal ion were visible only at the first 200 ns, and the single-charged metal ion reached the line intensity maximum. The relative intensities of ion line decrease with the increasing time, as opposite to atomic line became more intensive after 1 μs. The max electron density and ion temperature was between 400 ns and 600 ns, then ion temperature decreased from 1.3 eV down to 0.9 eV at the following 4 μs, but the electron density varied so irregularly that further investigation was required in furture.