Infrared emission spectra of candidate interstellar aromatic molecules.

Abstract:

:Interstellar dust is responsible, through surface reactions, for the creation of molecular hydrogen, the main component of the interstellar clouds in which new stars form. Intermediate between small, gas-phase molecules and dust are the polycyclic aromatic hydrocarbons (PAHs). Such molecules could account for 2-30% of the carbon in the Galaxy, and may provide nucleation sites for the formation of carbonaceous dust. Although PAHs have been proposed as the sources of the unidentified infrared emission bands that are observed in the spectra of a variety of interstellar sources, the emission characteristics of such molecules are still poorly understood. Here we report laboratory emission spectra of several representative PAHs, obtained in conditions approximating those of the interstellar medium, and measured over the entire spectral region spanned by the unidentified infrared bands. We find that neutral PAHs of small and moderate size can at best make only a minor contribution to these emission bands. Cations of these molecules, as well as much larger PAHs and their cations, remain viable candidates for the sources of these bands.

journal_name

Nature

journal_title

Nature

authors

Cook DJ,Schlemmer S,Balucani N,Wagner DR,Steiner B,Saykally RJ

doi

10.1038/380227a0

subject

Has Abstract

pub_date

1996-03-21 00:00:00

pages

227-9

issue

6571

eissn

0028-0836

issn

1476-4687

journal_volume

380

pub_type

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