Spectroscopy and chemistry of interstellar ice analogues

Leiden Repository

Spectroscopy and chemistry of interstellar ice analogues

Type: Doctoral Thesis
Title: Spectroscopy and chemistry of interstellar ice analogues
Author: Bouwman, Jordy
Publisher: Sackler Laboratory for Astrophysics, Leiden Observatory, Faculty of Science, Leiden University
Issue Date: 2010-10-12
Keywords: Photochemistry
Spectroscopy
Solid-State
Interstellar meduim
PAHs
Abstract: Mid-infrared (mid-IR) astronomical observations show that molecules freeze out on interstellar grains to form interstellar ices. These ices play an important role in the chemical evolution of molecules in space. Understanding the physical interactions and chemical reactions that take place in these ices gives us important clues to how the ices are formed and which role they play in the formation of complex molecules. The physical interactions in H2O:CO binary ices and in CH3OH and NH3 containing ices are studied both in the laboratory and in space by means of mid-IR spectroscopy, resulting in the unambiguous detection of NH3 in a low-mass protostar. Additionally, mid-IR and near-UV/VIS spectroscopic measurements on the ultraviolet induced photochemistry of large molecules, Polycyclic Aromatic Hydrocarbons (PAHs), trapped in ices are described. These molecules are known to be abundantly present in space, but their influence on the chemical evolution of interstellar ices has never been studied in detail. The experiments indicate that the processes are important in the formation of complex and charged molecules and that new astrochemical models should take the role of PAHs in ice into account.
Description: Promotor: H.V.J. Linnartz, Co-promotor: L.J.Allamandola
With Summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Bouwman, J., 2010, Doctoral Thesis, Leiden University
ISBN: 9789090256863
Sponsor: Stichting voor Fundamenteel Onderzoek der Materie (FOM) Nederlandse Onderzoekschool Voor Astronomie (NOVA)
Handle: http://hdl.handle.net/1887/16027
 

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