Si2o2+ - Photodissociation And Optical Absorption Properties

Studemund, Taarna

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https://hdl.handle.net/2142/116564 Copy

Description

Title

Si2o2+ - Photodissociation And Optical Absorption Properties

Author(s)

Studemund, Taarna

Contributor(s)

• Dopfer, Otto
• Mickein, Emil
• Pollow, Kai
• Förstel, Marko

Issue Date

2022-06-21

Keyword(s)

Photodissociation and photochemistry

Abstract

Interstellar dust consists mainly of $\mu$m-sized silicate particles. Their origin and evolutionary development processes are still poorly understood. So far, only molecular SiO as a possible precursor has been observed and identified in a circumstellar disk [1]. We present experimental data and quantum chemical calculations of absorption and dissociation properties of \chem{Si_2O_2^+} clusters. These cations represent possible intermediates between the circumstellar diatomic SiO molecule and the silicate grains observed in the interstellar medium. These optical spectra provide the first spectroscopic information for any \chem{Si_nO_m^+} cation larger than \chem{SiO^+}. These spectra are the first optical absorption spectra of \chem{Si_2O_2^+} cations. We were able to obtain those by photodissociation spectroscopy of mass-selected ionsin a tandem mass spectrometer coupled to a laser vaporization source [2]. Here, the experimental results will be compared with TD-DFT calculations and discussed in an astrophysical context. \\ Literature: \\ [1] R. Wilson et al., Astrophys. J., 1971, 167, L97. \ [2] M. Förstel et al., Rev. Sci. Instrum., 2017, 88, 123110.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116564&&

DOI

https://doi.org/10.15278/isms.2022.TJ04

Copyright and License Information

Copyright 2022 held by the authors

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