1. Strong-field and Ultrafast Photonics Laboratory, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China; 2. Beijing Institute of Space Mechanics and Electricity, China Academy of Space Technology, Beijing 100094, China
Abstract In the femtosecond laser-produced Cu-plasma, the transient transition dynamics that the excited state 5s'4D7/2 via electron-ion recombination transfers to 4p'4F9/20 (465.11 nm, Λ1 line) and 4p'4D7/20 (529.25 nm, Λ2 line) states are investigated by using the time-resolved spectroscopy. The occupation number and relevant lifetime of the excited state 5s'4D7/2, the temporal evolutions of spectral intensities for Λ1 line and Λ2 line emissions are demonstrated to be in direct proportion to the employed laser intensity, which reveals the transient features of transition dynamics clearly differing from that resulted in the traditional collision excitation. Furthermore, some unique characteristics for Λ1 and Λ2 transitions stemming from electron-ion recombination are examined in detail.
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