Old astronomic riddle on the way to be solved

July 15, 2015
Ionized Buckminsterfullerene (C60+) is present at the gas-phase in space. Credit: University of Basel

Scientists at the University of Basel were able to identify for the first time a molecule responsible for the absorption of starlight in space: the positively charged buckminsterfullerene. Their results have been published in the current issue of Nature.

Almost 100 years ago, astronomers discovered that the spectrum of star light arrived on earth with dark gaps, so-called interstellar bands. Ever since, researchers have been trying to find out which type of matter in space absorbs the light and is responsible for these "diffuse interstellar bands" (DIB) of which over 400 are known today.

Football molecule and interstellar clouds

Astronomers have been suspecting for a while that big complex and gaseous ions based on carbon could be absorbing the starlight. The is such a molecule: a structure made up of 60 carbon atoms shaped like a football that was first discovered in the mid-1980s.

After this discovery, the questions arose if it was possible that the football molecule was in fact responsible for the DIB. The research team led by Prof. John P. Maier from the Department of Chemistry at the University of Basel has been studying the electronic absorption of the ionized buckminsterfullerene since 1993. In fact, the spectrum measured in the lab did show absorption features at two wavelengths that were near two DIB that had been discovered by astronomers the following year.

Conditions similar to outer space

In order to unequivocally prove that these molecules absorb starlight and thus produce the DIB, a gas phase spectrum of the ion was needed. The Basel researchers now succeeded at this: "This is the very first unequivocal identification of such a molecule in the ", says Professor John P. Maier. "We have achieved a breakthrough in solving the old riddle of the ."

In order to obtain the spectrum in the laboratory using a diode laser, several thousand ionized Fullerenes were confined in a radiofrequency trap and cooled down by collisions with high density helium to very low temperatures of around 6 degree Kelvin - conditions very similar to .

The absorptions measured in the laboratory coincide exactly with the astronomical data, and have comparable bandwidths and relative intensities. This identifies for the first time two DIB and proves that ionized buckminsterfullerene (C60+) is present at the gas-phase in space. "This is remarkable, considering the complexity of this molecular ion and the presence of high-energy radiation in such an environment", says Maier.

Explore further: Mysterious stellar absorption lines could illuminate 90-year puzzle

More information: E. K. Campbell, M. Holz, D. Gerlich & J. P. Maier, Laboratory confirmation of C60+ as carrier of two diffuse interstellar bands, Nature (2015), DOI: 10.1038/nature14566

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LariAnn
5 / 5 (3) Jul 15, 2015
I'd like to see this research expanded to see if compounds derived from fullerene are responsible for others of the DIBs. It's not hard to imagine that these large molecules could react with other compounds or elements over time in space to form new compounds that could be responsible for DIBs.

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