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Title:INFRARED SPECTROSCOPY ON SMALL METAL-BEARING OXIDES
Author(s):Witsch, Daniel
Contributor(s):Giesen, Thomas; Fuchs, Guido W.; Breier, Alexander A.
Subject(s):Astronomy
Abstract:Interstellar dust is an integral part of the interstellar medium and is important for star forming processes and the associated chemical evolution in these regions. However the formation of dust is still not well understood. Around oxygen rich late type stars, titanium oxides are thought of being an important seed molecule of the dust formation and has been observed at optical and radio wavelengths.\\ \\ A new generation of high resolution infrared telescope instruments, like TEXES at Gemini North or EXES onboard SOFIA, allows the identification of astrophysical molecules by means of their rovibrational spectra, probing warm atmospheres of evolved late type stars in the mid-infrared.\\ \\ In this talk we present high resolution laboratory spectra of titanium monoxide (TiO) and its isotopologues in the gas-phase around 1000\wn (10\,$\mu$m). In a global fit we determine molecular parameters of the vibrational excited states with high accuracy. In our experiments, molecules are produced using high intense laser pulses to ablate a titanium sample in an atmosphere of nitrous oxide diluted in helium buffer gas. Guided through a reaction channel different molecules - including TiO - are formed. Subsequent adiabatic expansion in a supersonic jet cools down the molecules to rotational temperatures of around 30\,K. To record a rotationally resolved infrared spectrum a quantum cascade laser is used.
Issue Date:06/20/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100655
DOI:10.15278/isms.2018.WL09
Other Identifier(s):WL09
Date Available in IDEALS:2018-08-17
2018-12-12


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