演講資訊

摘要：

Laboratory astrophysics utilizes low-temperature, ultra-high vacuum systems to simulate astrophysical environments. In these experiments, astrophysical ice analogs are irradiated with energetic sources such as electrons, ions, X-rays, and vacuum ultraviolet (VUV) photons to study the chemical and physical evolution of ices under energetic processing. These studies aim to address key astronomical questions, such as: Why are gas-phase molecules present in cold molecular clouds? Why are complex organic molecules abundant in protoplanetary disks? How were amino acids detected in comet 67P produced? In this talk, I will present a series of results from our laboratory, accumulated over the past decade, focusing on VUV photon-induced desorption processes in astrophysical ices. I will begin by discussing the fundamental interactions between energetic photons and ice molecules, and explore how the absorbed energy is transferred to neighboring molecules within the ice matrix. Furthermore, I will introduce recent work that critically evaluates the fitting models widely used to interpret infrared spectra obtained by the James Webb Space Telescope (JWST). In particular, I will highlight how the composition and structure of interstellar dust, as revealed through laboratory astrophysics studies, play a crucial role in influencing infrared spectroscopic measurements.