Molecules in Grains (MIGS) as the Source of the Unidentified Infrared Bands (UIRs)

Details Molecules in Grains (MIGS) as the Source of the Unidentified Infrared Bands (UIRs) Molecules in Grains (MIGS) as the Source of the Unidentified Infrared Bands (UIRs)

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.5915b&link_type=abstract

American Astronomical Society Meeting 205, #59.15; Bulletin of the American Astronomical Society, Vol. 36, p.1441

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a model for interstellar grains that is able to closely reproduce the observed UIR spectral features at 3.3, 6.2, 7.7, 8.6, and 11.3 μm. The particles consist of highly porous "closed-cell" siliceous or carbonaceous foam that holds and retains molecules of H20, CH4, SiO and SiH4 in its interior. Surface interactions between the trapped molecules and interior grain surfaces result in pressure broadening and frequency shifts. The pressure broadening is sufficiently high to produce smooth spectral contours for the molecular vibration-rotation emission bands. The small grains (20 nm) are heated by absorbing single UV photons. The stability, lifetime, chemistry, composition and formation of MIGs are discussed in the context of astrophysical possibility.

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