| Time：1110309 (Wed.) 14:20~16:20
Speaker：Prof. 羅佩凌(Pei-Ling Luo) 中央研究院原子與分子科學研究所/Institute of Atomic and Molecular Sciences, Academia Sinica Title：Mid-infrared time-resolved dual-comb spectroscopy Abstract：Time-resolved infrared spectroscopy, offering both temporal and spectral resolution in the experimental measurements, plays an important role in atmospheric, biological, and chemical physics studies. Dual-comb spectroscopy, a multi-heterodyne Fourier transform spectroscopy based on two frequency combs at slightly different repetition frequencies, enables broadband molecular fingerprinting with high-resolution and fast spectral acquisition. Here, a new approach for high-resolution time-resolved spectroscopy using mid-infrared dual-comb spectrometers will be reported. Employing the dual-comb spectrometer coupled with a Herriott multipass absorption cell, simultaneous determination of multiple species, including methanol, formaldehyde, HO2 and OH radicals can be achieved. The time-resolved spectral mappings under different experimental conditions are obtained with Doppler-limited resolution at tens of microsecond time resolution. Moreover, high-resolution precision measurements of short-lived molecules, such as the simplest Criegee intermediate (CH2OO) are also presented via microsecond-time-resolved dual-comb spectral mapping. The new approach with time-resolved dual-comb spectroscopy holds promise not only in exploring the issues of chemical physics but also in discovering transient processes of light-matter interactions in different fields. Place：S101, Gongquan Campuses, NTNU |
