Development of Highly Time-resolved High Frequency EPR and Application to Studies on the Excited States

为EPR装置的构建及其研究应用取得了以下成果。1.为了提高W波段电子顺磁共振系统的时间分辨率，我们购买了宽带放大器，并进行了2000阻抗匹配，使时间分辨率达到了5纳秒以下，同时降低了信号的损耗.我们将这种高频EPR机应用于激发态的研究，获得了激发态动力学和自旋弛豫的数据.在热平衡条件下，我们还首次获得了三重态自由基体系激发多重态的EPR信号。这样的光谱更容易分析的多重态之间的能量差和交换相互作用参数J.4。极化光谱现在很容易分析通过使用上面获得的数据（在热平衡条件下）在激发态动力学和自旋弛豫方面。有了这些数据（多重态之间的能量差，交换相互作用参数J，激发态动力学和自旋弛豫），我们成功地减去重要的因素，确定激发态性质在两个不同的异构体自由基激发三重态系统。

The following results were obtained for the construction of the EPR apparatus and its research applications.1. In order to increase time-resolution of the W-band EPR system, we bought a wide band amplifier, made impedance matching to 2000, and achieved a time resolution of less than 5 nano-seconds and a decrease of the loss of the signals.2. We applied this high frequency EPR machine to the studies of excited multiplet states and obtained data of excited state dynamics and spin relaxations.3. We also obtained EPR signals for the first time under a thermal equilibrium condition in the excited multiplet states of an excited triplet-radical system. Such spectra were more easily analyzed in terms of an energy difference between the multiplet states and an exchange interaction parameter J.4. The polarized spectra are now easily analyzed by using the data obtained above (under a thermal equilibrium condition) in terms of excited state dynamics and spin relaxations.5. With these data (an energy difference between the multiplet states, an exchange interaction parameter J, excited state dynamics, and spin relaxations), we succeeded in subtracting important factors which determine excited state properties in two different isomer radicals-excited triplet systems.