[Electron temperature of Al plasma estimated with Ar].

Protected with Ar, it would induce atom Ar breakdown to ablate aluminum target with a pulsed Nd: YAG laser beam. Further more, a lot of Ar+ ionic characteristic lines radiation appeared accompanying the aluminum plasma emission. In this work, based on the Ar+ ionic characteristic lines radiation, we analyzed time-resolved behavior of four Ar+ ionic characteristic lines Ar II 385.057, Ar II 386.853, Ar II 404.291 and Ar II 407.201 nm, respectively. Electron temperature of aluminum plasma in the stage of ionic lines emission was approximately calculated. As a result, in this stage, the electron temperature ranged from 15 000 to 22000 K, and decreased successively with the delay time increasing. Compared with other similar works, we found that our results agreed with many similar estimations.