TIME RESOLVED XAS STUDIES OF TRIPLET STATES

时间分辨结构测定走在了 试图了解蛋白质反应的机制。我们有 演示了一种收集高质量x射线吸收的系统 微秒时间尺度上的光谱数据。该方法可用于 用于全光谱积累和动力学光度测定。 该系统已被用来研究三重态的形成 在锌和铂取代的原和八乙基卟啉中， 其中激发态结构具有强烈的理论意义。 初步数据显示，激发态的结构变化很小， 意味着金属只是轻微地移出了卟啉平面 在光激发下。

Time-resolved structure determinations are at the forefront of attempts to understand the mechanisms of protein reactions. We have demonstrated a system for collecting high quality x-ray absorption spectroscopy data on microsecond timescales. The method can be used for both full spectra accumulation and kinetic spectro-photometry. This system has been used to examine the formation of triplet states in zinc and platinum substituted proto- and octaethyl prophyrins, where the excited state structure is of intense theoretical interest. Preliminary data show little structural change in the excited state, implying only minor movement of the metal out of the porphyrin plane upon photo-excitation.