Infrared spectroscopy on small metal-bearing oxides

Witsch, Daniel

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https://hdl.handle.net/2142/100655 Copy

Description

Title

Infrared spectroscopy on small metal-bearing oxides

Author(s)

Witsch, Daniel

Contributor(s)

• Giesen, Thomas
• Fuchs, Guido W.
• Breier, Alexander A.

Issue Date

2018-06-20

Keyword(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 1000cm−1 (10 µm). 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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100655

DOI

10.15278/isms.2018.WL09

Copyright and License Information

Copyright 2018 Daniel Witsch

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