讲座题目：Incoherent Broadband Cavity-Enhanced absorption Spectroscopy: Applications in Atmospheric Simulation Chambers

讲座时间：2023年4月27日（星期四）上午 10:30—11:30

讲座地点：图书馆六层报告厅

主讲人：Pro. Andy Ruth

研究方向：气相、液相和固相化合物的激光光谱和光物理的研究

讲座简介：

We describe the application of incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) for the in situ detection of atmospheric trace gases and radicals (NO₃, NO₂, O₃, H₂O) in an atmospheric simulation chamber under realistic atmospheric conditions. The length of the optical cavity across the reaction chamber is 4.5 m, which is significantly longer than in previous studies that use high finesse optical cavities to achieve high absorption sensitivity. Using a straightforward spectrometer con figuration, we show that detection limits corresponding to typical atmospheric concentrations can be achieved with a measurement time of seconds to a few minutes. In particular, with only moderate reflectivity mirrors, we report a measured sensitivity of 4 pptv to NO₃in a 1 min acquisition time. The high spatial and temporal resolution of the IBBCEAS method and its pptv sensitivity to NO₃makes it useful in laboratory studies of atmospheric processes as well as having obvious potential for field measurements.

主讲人简介：

Prof. Andy Ruth，爱尔兰科克大学大气化学研究中心教授，宽带腔增强技术创始人。1986年本科毕业于德国达姆施塔特工业大学，1989年硕士毕业于德国哥廷根大学，1992年博士毕业于马克斯-普朗克生物物理化学研究所（MPIbpc）/哥廷根大学，1992年任教于德国柏林工业大学，2001-2003年任教爱尔兰科克大学化学系，2003-2006年任教爱尔兰科克大学(UCC)物理系讲师，2006年-至今，爱尔兰科克大学教授。主要从事于气相、液相和固相化合物的激光光谱和光物理的研究。UCC物理系激光光谱团队创始人和负责人，大气化学研究中心主任兼科长，环境研究所研究联盟成员。