Herein, we review studies on the dynamics of excited radical ions. The enhanced reactivities of excited radical ions are recognized by many researchers based on product analysis studies conducted around 1980. For cases involving fluorescent excited radical ions, lifetime measurements provide information on excited states, and they sometimes lead to confusion owing to emissive byproducts resulting from their higher reactivities. Nanosecond laser flash photolysis studies provide evidence of the reactions of excited radical ions, and analyses of their kinetics reveal properties such as their excited-state lifetimes despite an indirect manner. Recent femtosecond laser flash photolysis studies provide detailed pictures of excited radical ions, though such studies are few. Furthermore, studies on dyad or triad systems, including excited radical ions, show electron transfer dynamics and disclose characteristics of excited radical ions that differ from those in neutral states. Larger electronic coupling and smaller dumping factor are reported as important characteristics of electron transfer systems of excited radical ions. These systematic studies on excited radical ions demonstrate their suitability for applications.

本文中，我们回顾了关于激发自由基离子动力学的研究。基于研究人员在1980年左右进行的产品分析研究，许多研究人员认识到了激发的自由基离子增强的反应性。对于涉及荧光激发的自由基离子的情况，寿命测量可以提供有关激发态的信息，由于它们产生的发射副产物，有时会引起混淆更高的反应性。纳秒激光闪光光解研究为激发的自由基离子的反应提供了证据，并且对其动力学的分析揭示了诸如其激发态寿命之类的特性，尽管是间接的方式。最近的飞秒激光闪光光解研究提供了激发的自由基离子的详细图片，尽管这种研究很少。此外，有关二元或三元体系（包括激发的自由基离子）的研究，展示了电子转移动力学，并揭示了与中性态不同的激发自由基离子的特性。据报道，较大的电子耦合和较小的倾销因数是激发的自由基离子的电子转移系统的重要特征。对激发的自由基离子的这些系统研究证明了其适用性。