期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 712, 期 1, 页码 L16-L20出版社
IOP Publishing Ltd
DOI: 10.1088/2041-8205/712/1/L16
关键词
astrochemistry; dust, extinction; ISM: molecules; molecular data; techniques: spectroscopic
资金
- Deutsche Forschungsgemeinschaft (DFG)
Mixtures of polycyclic aromatic hydrocarbons (PAHs) have been produced by means of laser pyrolysis. The main fraction of the extracted PAHs was primarily medium-sized, up to a maximum size of 38 carbon atoms per molecule. The use of different extraction solvents and subsequent chromatographic fractionation provided mixtures of different size distributions. UV-VIS absorption spectra have been measured at low temperature by matrix isolation spectroscopy and at room temperature with PAHs as film-like deposits on transparent substrates. In accordance with semi-empirical calculations, our findings suggest that large PAHs with sizes around 50-60 carbon atoms per molecule could be responsible for the interstellar UV bump at 217.5 nm.
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