Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angch..29..595h&link_type=abstract
Angew. Chem., Vol. 29, No. 6, p. 595 - 608
Astronomy and Astrophysics
Astronomy
Interstellar Molecules: Polycyclic Hydrocarbons, Interstellar Molecules: Molecular Processes, Interstellar Clouds: Interstellar Molecules
Scientific paper
Within the last ten to twenty years, radioastronomers have discovered the existence of almost 100 different molecules in interstellar space. The molecules are mainly organic in nature and comprise species known to be both stable and common in the laboratory as well as those both unstable and uncommon under terrestrial conditions, including radicals and molecular ions. Although the gas phase of interstellar clouds is well studied via spectroscopic techniques, the dust particles are much more poorly characterized via their scattering and absorption of visible radiation as well as some broad resonances in the ultraviolet and infrared regions of the spectrum. It is normally thought that these submicron-sized particles consist of cores that are composites of silicate and carbonaceous materials with mantles that contain material deposited from the gas such as ices of water, ammonia, and methane. In addition to the dust particles and gaseous molecules, there is some evidence for very large aromatic molecules (the so-called polycyclic aromatic hydrocarbons or PAH's) which occupy a nether region in between large gas-phase species and small dust particles.
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