Abstract
Characteristic decay times of continuum and emission doublet intensities (MgII 279.6 and 280.3, CaII 393.4 and 396.8, NaI 589 and 589.6 nm) are presented. Measurements were carried out for plasma induced by a 42-fs laser pulse within a time interval of 0–85 ns. It is shown that the NaI doublet intensity is described by a monoexponential dependence throughout the whole observation time interval. Using the triple recombination coefficient, the electron density has been estimated to vary from 3.0 × 1016 to 2.4 × 1015 cm−3. The validity of the local thermodynamic equilibrium criterion and the dependence of the line intensity-to-background ratio on the delay time are studied.
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