You are most welcome to a knowledge-sharing seminar presented by Dr. Ha Tran Senior Researcher at Ecole Polytechnique, Paris, France. With a friendly atmosphere, you will have a great chance to discuss and communicate with the scientist for any potential collaborations or research experience.

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Title:

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Collisional effects on the line shape of infrared absorption transitions and high-precision atmospheric remote sensing

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Abstract: 

Precise knowledge of molecular line shape is essential for accurate remote sensing of our atmosphere based on its absorption or emission of infrared radiation. Recent works on the modelling of collisional effects on the spectral shapes will be reviewed in this talk. It will be shown that the use of the Voigt profile leads to large discrepancies with respect to measured spectra and accounting for different refined collisional effects is unavoidable to correctly model measurements. Comparison between laboratory, atmospheric spectra and refined models will be presented showing important improvement.

Biography:

Dr. Ha Tran is a Senior Researcher at the Laboratoire de Météorologie Dynamique, Ecole Polytechnique, Paris, France. She has been studying the spectral shape of absorption spectra and its implications in atmospheric remote sensing. Various models have been developed to take into account the modifications of absorption spectra due to pressure. In many cases, these have been used to generate relevant data and software leading to significant improvements in simulation/treatment of atmospheric spectra. Her recent works have led to a new reference model called the Hartmann-Tran profile, recommended by IUPAC for representing high-resolution spectroscopic transition. Ha Tran is author and co-author of more than 100 papers in peer review journals and about 20 invited talks in international conferences.

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Time: 10:00 CET Saturday, January 28th, 2023

Zoom link: https://lu-se.zoom.us/j/64527653947

Chairmain: Assc. Prof. Ngoc Diep Lai

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