Theoretical calculation results show that electron flow occurs from xanthene to the phenyl ring within the Rh101⁺ after its electronic transition from ground state (S₀) to first excited state (S₁). Time and frequency resolved transient grating (TG) spectroscopy is then conducted to seek the experimental evidence. Through Fourier analysis at different wavelengths of TG signal and their specific value spectra, vibrational enhancement corresponding to electron acceptor chromophore (phenyl ring) is observed. So the ultrafast vibrational energy redistribution process is detected experimentally and the direction of electron flow is confirmed.

中文翻译：

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通过时间和频率分辨瞬态光栅光谱跟踪分子内电子和振动能的重新分布

理论计算结果表明，在电子从基态（S ₀）跃迁至第一激发态（S ₁）后，电子在Rh101 ^+中从x吨流向苯环。然后进行时间和频率分辨瞬态光栅（TG）光谱分析以寻找实验证据。通过在TG信号不同波长处的傅立叶分析及其比值光谱，观察到与电子受体发色团（苯环）相对应的振动增强。因此，通过实验检测了超快振动能量的重新分配过程，并确定了电子流的方向。