Analysis of time phase of characteristic radiation in plasma induced by laser ablating aluminum

With time and space resolved technique, we have recorded time resolved spectra of irradiation of the plasma induced by Nd: YAG laser ablating metal Aluminum in Ar, in which, laser pulse energy was set up to 145 mJ/pulse and the buffer pressure 100 kpa. The continuum radiation and special emission of Aluminum plasma were studied based on the records. According to time distribution of Al Ⅰ396.15 nm emission, we analyzed the time differences between characteristic and continuum radiation evolving. We tried to explain the time phases of characteristic radiation evolving with traditional theoretical model of atomic transition. As the result, we found that it was difficult to explain our experimental results with the model. In order to explain our experimental results, we need new model or to improve the traditional theoretical model of atomic transition.