Fig. 5: Behavior of photo-excited holes near A (526.3 eV) at extended times. | Nature Communications

Fig. 5: Behavior of photo-excited holes near A (526.3 eV) at extended times.

From: Direct and real-time observation of hole transport dynamics in anatase TiO2 using X-ray free-electron laser

Fig. 5

Initial behaviors of hole transients at energy levels from below to above A for (a) SC and (d) NC. b, e Normalized kinetic trace of transient XAS around photon energies indicated as A. Insets: Transients at gap energies. In a SC (b), longer-lifetime components are negligibly small (c). In a NC (e), longer-lifetime components are observed as elevated baselines (c and f). The elevated baselines do not cross zero value at A. This corresponds to ~20 % at a time delay of 40 ps. The data are fitted using three exponential decay functions. c The hole transients at A for the delay time up to 300 ps. Inset: Decay time constant (amplitude) used to fit the three exponential decay functions. f Ratios of long lifetime (230 ps) component as a function of energy positions. Inset: Peak position vs energy position in a and d. Error bars correspond to the standard error.

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