MRI: Acquisition of an Ultrafast Transient Absorption Spectrometer

该奖项由主要研究仪器项目和化学研究仪器项目支持。佛罗里达州立大学的肯尼斯·汉森教授和同事朱磊获得了一台超快瞬时吸收激光光谱仪。瞬时吸收(TA)光谱是一种强大的技术，用于监测样品在被激光闪光激发后的能量吸收(即颜色)随时间的变化。TA被用来研究光化学和光物理过程，如将阳光转化为能量。这样的过程可以非常快，在飞秒的时间尺度上，比1秒快14个数量级。超快激光系统被用来表征具有理想性能的新材料，如更好的太阳能电池或发光二极管。该光谱仪用于培训佛罗里达州立大学和其他机构的学生超快技术和应用，这些机构包括邻近的HBCU佛罗里达农工大学，以及中佛罗里达大学、佛罗里达新学院、弗吉尼亚军事学院和南卡罗来纳大学。该奖项将广泛加强研究和教育。一个正在研究的领域是具有自组装有机-无机界面的材料中的光电流产生。目前还在研究可以同时发射不同波长的荧光分子，用于包括生物成像在内的应用。光磁体是一组基本有趣且技术前景看好的光响应材料，其性能正在评估中。卤化物钙钛矿因其在太阳能电池等光电子器件中的优异性能而备受关注。与橡树岭国家实验室合作，还研究了具有独特光物理性质的低维有机金属卤化物中的激子自捕获(或激发态结构重组)过程。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This award is supported by the Major Research Instrumentation and the Chemistry Research Instrumentation Programs. Professor Kenneth Hanson from Florida State University and colleague Lei Zhu have acquired an ultrafast transient absorption laser spectrometer. Transient absorption (TA) spectroscopy is a powerful technique for monitoring a sample's change in energy absorbance (i. e., color) with respect to time after excitation by a flash of light from a laser. TA is employed to study photochemistry and photophysical processes such as the conversion of sunlight into energy. Such processes can be very fast, on a time scale of a femtosecond which is 14 orders of magnitude faster than 1 second. The ultrafast laser system is used to characterize new materials which have desirable properties such as better solar cells or light emitting diodes. The spectrometer is used to train students in ultrafast technology and applications at Florida State University and other institutions including the neighboring HBCU Florida A&M University as well as Central Florida University, New College of Florida, Virginia Military Institute and the University of South Carolina. The award will enhance research and education broadly. One research area being investigated is photocurrent generation in materials with self-assembled organic-inorganic interfaces. Fluorescent molecules that can emit simultaneously at different wavelengths for applications including bio-imaging are also currently investigated. The properties of photomagnets, a fundamentally interesting and technologically promising group of light responsive materials, are being evaluated. Halide perovskite are intensively studied for their remarkable performance in optoelectronic devices such as solar cells. Exciton self-trapping (or excited state structural reorganization) processes in low dimensional organic metal halide hybrids with unique photophysical properties are also studied in a collaboration with Oak Ridge National Laboratory.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.