Electronic Spectroscopy of Anthracene Cations and Protonated Anthracene in the Search for Carriers of Diffuse Interstellar Bands

Abstract The helium-tagging technique was employed to record absorption spectra of cold anthracene cations and protonated anthracene. The evaluation of the spectra of the chromophore with a different number of attached He atoms allows getting the precise band positions of the molecular ions in the g...

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Bibliographic Details
Published in:The Astrophysical journal 2021-06, Vol.913 (2), p.136
Main Authors: Meyer, Miriam, Martini, Paul, Schiller, Arne, Zappa, Fabio, Krasnokutski, Serge A., Scheier, Paul
Format: Article
Language:English
Subjects:
Absorption
Absorption bands
Absorption spectra
Anthracene
Astrochemistry
Astrophysics
Atomic properties
Cations
Chromophores
Diffuse interstellar bands
Helium
Interstellar molecules
Ions
Molecular ions
Molecular spectroscopy
Polycyclic aromatic hydrocarbons
Position measurement
Spectroscopy
Spectrum analysis
Temperature effects
Vapor phases
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Summary:Abstract The helium-tagging technique was employed to record absorption spectra of cold anthracene cations and protonated anthracene. The evaluation of the spectra of the chromophore with a different number of attached He atoms allows getting the precise band positions of the molecular ions in the gas phase. The positions of the two most intense bands of anthracene, suitable for astrophysical detection, were found to be λ max = 3478.9 ± 1.8 Å and λ max = 7068.9 ± 5.7 Å. A considerable shift of the red band position compared to a previous measurement was attributed to a temperature effect. No coincidence of the absorption bands in astrophysical observational spectra was found. This allows estimating the upper limit for the abundance of anthracene cations per H nuclei
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abf93e