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“Interstellar ices in dark molecular clouds: structure and chemical complexity"
Thursday, 10 June 2021
Video-Recording for any system with MP4-support
- Video.mp4 (ca. 203 Mb)
- Video_with_eng_sub.mp4 (ca. 207 Mb)
15:15 – 16:05
Dust particles covered by icy mantles play a crucial role in the formation of
molecules in the Interstellar Medium (ISM). These icy mantles are mainly
composed of water but many other chemical species are also contained in these ices.
The structure of this ice mantle plays in important role in the capacity to hold
other species, promote reactions, and take up energy. It further can be used as
a diagnostic tool, since the spectroscopy varies with ice structure.
Although amorphous solid water (ASW) is widely studied and is generally
well characterized by different techniques, energetically-induced structural changes,
such as ion, electron and photon irradiation, in these materials are less well
understood. Selective pumping of specific infrared (IR) vibrational modes can aid
in understanding the role of vibrations in restructuring of hydrogen bonding
networks. I will present the experimental results on hydrogen bonding changes
in ASW induced by mid-IR free-electron laser (FEL) radiation.
Upon resonant irradiation, a modification in IR absorption band profile of ASW is
observed which is analysed in terms of hydrogen bonding donors and acceptors
and the experiments are complimented with Molecular Dynamics simulations
to constrain the effect at the molecular level. I will further present work on the
formation of complex molecules such as glycine in ASW at low temperatures
and without UV light.
Speaker today: Herma Cuppen (Radboud University & University of Amsterdam)
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