Population inversion in fluorescing fragments of super-excited molecules inside an air filament*
See-Leang Chinb), Huai-Liang Xua)†
Fig.#cod#x0A0;8. Fluorescence signal of CH at around 431#cod#x0A0;nm versus the delay time between the pump and probe pulses; negative delay time means the probe pulses occur after the pump pulses. [ 30 ]