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Laser-induced plasma; delayed spectral emission

The spectroscopic analysis of the emission from the plasma produced by irradiating a highT_c superconducting GdBa₂Cu₃O₇ target with a high power Nd:YAG laser beam shows the existence of the bands from different oxides in addition to the lines from neutrals and ions of the constituent elements. The spectral emissions by oxide species in laser-induced plasma show considerable time delays as compared to those from neutral and ionic species. Recombination processes taking place during the cooling of the hot plasma, rather than the plasma expansion velocities, have been found to be responsible for the observed time delays in this case. The decays of emission intensities from various species are found to be non-exponential.

G Padmaja¹ A V Ravi Kumar¹ V Vidyalal¹ P Radhakrishnan¹ V P N Nampoori¹ C P G Vallabhan¹

1. Department of Physics, Cochin University of Science and Technology, Cochin - 682 022, India

Published

June 1991