Gas Phase Absorption Spectroscopy of C+60 and C+70 in a Cryogenic Ion Trap: Comparison with Astronomical Measurements

Campbell, E. K. and Holz, M. and Maier, J. P. and Gerlich, D. and Walker, G. A. H. and Bohlender, D.. (2016) Gas Phase Absorption Spectroscopy of C+60 and C+70 in a Cryogenic Ion Trap: Comparison with Astronomical Measurements. The Astrophysical Journal , 822 (1). p. 17.

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Recent low-temperature laboratory measurements and astronomical observations have proved that the fullerene cation C60+ is responsible for four diffuse interstellar bands (DIBs). These absorptions correspond to the strongest bands of the lowest electronic transition. The gas phase spectrum below 10 K is reported here for the full wavelength range encompassed by the electronic transition. The absorption spectrum of C70+, with its origin band at 7959.2 Å, has been obtained under similar laboratory conditions. Observations made toward the reddened star HD 183143 were used in a specific search for the absorption of these fullerene cations in diffuse clouds. In the case of C60+, one further band in the astronomical spectrum at 9348.5 Å is identified, increasing the total number of assigned DIBs to five. Numerous other C60+ absorptions in the laboratory spectrum are found to lie below the astronomical detection limit. Special emphasis is placed on the laboratory determination of absolute absorption cross-sections. For C60+ this directly yields a column density, N(C60+) of- 2x10^13 cm-2 in diffuse clouds, without the need to rely on theoretical oscillator strengths. The intensity of the C70+ electronic transition in the range 7000–8000 Å is spread over many features of similar strength. Absorption cross-section measurements indicate that even for a similar column density, the individual absorption bands of C70+ will be too weak to be detected in the astronomical spectra, which is confirmed giving an upper limit of 2 mÅ to the equivalent width.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Former Organization Units Chemistry > 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
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:03
Deposited On:23 May 2016 07:02

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