Time-resolved XAS is an effective method to investigate photoexcitation processes of metal complexes in solutions. The time-resolved XAS measurements were realized from the almost coaxially introduction of the laser pulses to the liquid cell with soft X-ray pulses. The N K-edge XAS spectra of [Fe(phen)3]2+ aqueous solutions in the ground and photoexcited states were obtained by scanning the delay time of the soft X-ray pulses relative to the laser pulses. The relaxation process of the [Fe(phen)3]2+ complexes from the high spin state to the low spin states has been obtained from the ligand side at the N K-edge, which is close to that obtained by the Fe K-edge.
