The C 60 :C 60 + ratio in diffuse and translucent interstellar clouds

Rouillé, Gaël; Krasnokutski, Serge; Carpentier, Yvain

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1051/0004-6361/202142078

Title :

The C 60 :C 60 + ratio in diffuse and translucent interstellar clouds

Author(s) :

Rouillé, Gaël [Auteur]
Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany]
Krasnokutski, Serge [Auteur]
Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany]
Carpentier, Yvain [Auteur]

Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]

Journal title :

Astronomy & Astrophysics - A&A

Pages :

A100

Publisher :

EDP Sciences

Publication date :

2021-12

ISSN :

0004-6361

HAL domain(s) :

Physique [physics]

English abstract : [en]

Context. Insight into the conditions that drive the physics and chemistry in interstellar clouds is gained from determining the abundance and charge state of their components. Aims. We propose an evaluation of the C 60 :C ...
Show more >Context. Insight into the conditions that drive the physics and chemistry in interstellar clouds is gained from determining the abundance and charge state of their components. Aims. We propose an evaluation of the C 60 :C 60 + ratio in diffuse and translucent interstellar clouds that exploits electronic absorption bands so as not to rely on ambiguous IR emission measurements. Methods. The ratio is determined by analyzing archival spectra and literature data. Information on the cation population is obtained from published characteristics of the main diffuse interstellar bands attributed to C 60 + and absorption cross sections already reported for the vibronic bands of the cation. The population of neutral molecules is described in terms of upper limits because the relevant vibronic bands of C 60 are not brought out by observations. We revise the oscillator strengths reported for C 60 and measure the spectrum of the molecule isolated in Ne ice to complete them. Results. We scale down the oscillator strengths for absorption bands of C 60 and find an upper limit of approximately 1.3 for the C 60 :C 60 + ratio. Conclusions. We conclude that the fraction of neutral molecules in the buckminsterfullerene population of diffuse and translucent interstellar clouds may be notable despite the non-detection of the expected vibronic bands. More certainty will require improved laboratory data and observations.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL

Files

2109.07427
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