TIME RESOLVED XAS STUDIES OF TRIPLET STATES

时间分辨的结构测定处于 试图了解蛋白质反应的机制。 我们有 展示了一个收集高质量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分光光度法。 该系统已被用于检查的形成 三重 国 在锌和铂取代的原代和八乙基藜芦碱中， 其中激发态结构具有强烈的理论兴趣。 初步数据显示激发态的结构变化很小， 这意味着金属仅轻微地移动出卟啉平面 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.