El Khoury Youssef, Van Wilderen Luuk J G W, Vogt Tim, Winter Ernst, Bredenbeck Jens
Institut für Biophysik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany.
Rev Sci Instrum. 2015 Aug;86(8):083102. doi: 10.1063/1.4927533.
A spectroelectrochemical cell has been designed to combine electrochemistry and ultrafast two-dimensional infrared (2D-IR) spectroscopy, which is a powerful tool to extract structure and dynamics information on the femtosecond to picosecond time scale. Our design is based on a gold mirror with the dual role of performing electrochemistry and reflecting IR light. To provide the high optical surface quality required for laser spectroscopy, the gold surface is made by electron beam evaporation on a glass substrate. Electrochemical cycling facilitates in situ collection of ultrafast dynamics of redox-active molecules by means of 2D-IR. The IR beams are operated in reflection mode so that they travel twice through the sample, i.e., the signal size is doubled. This methodology is optimal for small sample volumes and successfully tested with the ferricyanide/ferrocyanide redox system of which the corresponding electrochemically induced 2D-IR difference spectrum is reported.
一种光谱电化学池被设计用于将电化学与超快二维红外（2D - IR）光谱相结合，超快二维红外光谱是一种在飞秒到皮秒时间尺度上提取结构和动力学信息的强大工具。我们的设计基于一面具有进行电化学和反射红外光双重作用的金镜。为了提供激光光谱所需的高光学表面质量，金表面通过电子束蒸发在玻璃基板上制成。电化学循环有助于通过二维红外光谱原位收集氧化还原活性分子的超快动力学信息。红外光束以反射模式运行，因此它们两次穿过样品，即信号大小翻倍。这种方法对于小体积样品是最优的，并且已成功应用于铁氰化物/亚铁氰化物氧化还原体系，并报道了相应的电化学诱导二维红外差分光谱。
