A seminar given by
PhD candidate at Marseille Astrophysics Laboratory (France)
Laboratory constraints on interstellar ices: thermal desorption and far-infrared optical properties
Abstract: The challenge of revealing the chemical composition, physical structure, and dynamics of the star and planet-forming regions advances when using all available tools, combining information from observations, models, and experiments. In this talk, I will present findings from laboratory experiments on thermal desorption and the optical properties of interstellar ices, which are crucial for refining models and interpreting observations.
We employed the Temperature-Programmed Desorption (TPD) technique to gather a series of ice sublimation data, which serves as a benchmark for current gas-grain astrochemical models. Additionally, we measured broadband optical constants of astrophysical ice analogues in the mid-infrared and terahertz ranges by combining state-of-the-art techniques, such as THz Time-Domain Spectroscopy and Fourier Transform Infrared Spectroscopy. This data is essential for accurately modelling dust continuum emission and radiative transfer in the dense and cold regions of the Interstellar Medium.
In conclusion, I will discuss the role of interstellar ices in the development of molecular complexity during the star formation process. Furthermore, I will highlight the application of novel laboratory techniques as benchmarks for interpreting broadband observations from existing and future ground-based facilities and space telescopes.
Photodissociation spectroscopy: a tool for probing biomolecules excited states properties