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Gas phase absorption of C702+ below 10 K: astronomical implications

Campbell, Ewen and Holz, Mathias and Maier, John P.. (2017) Gas phase absorption of C702+ below 10 K: astronomical implications. Astrophysical Journal, 835 (2). p. 4.

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Official URL: http://edoc.unibas.ch/58298/

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Abstract

The electronic spectrum of the fullerene dication C702+ has been measured in the gas phase at low temperature in a cryogenic radiofrequency ion trap. The spectrum consists of a strong origin band at 7030 Å and two weaker features to higher energy. The bands have FWHMs of 35 Å indicating an excited state lifetime on the order of one-tenth of a picosecond. Absorption cross-section measurements yield (2 ± 1) × 10−15 cm2 at 7030 Å. These results are used to predict the depth of diffuse interstellar bands (DIBs) due to the absorption by C702+. At an assumed column density of 2 × 1012 cm−2 the attenuation of starlight at 7030 Å is around 0.4% and thus the detection of such a shallow and broad interstellar band would be difficult. The electronic spectrum of C602+ shows no absorptions in the visible. Below 4000 Å the spectra of C60, C60+ and C602+ are similar. The large intrinsic FWHM of the features in this region, ~200 Å for the band near 3250 Å, make them unsuitable for DIB detection.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Physikalische Chemie (Maier)
UniBasel Contributors:Maier, John Paul and Campbell, Ewen and Holz, Mathias
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
ISSN:0004-637X
e-ISSN:1538-4357
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:05 Jan 2018 12:58
Deposited On:05 Jan 2018 12:58

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