Nature of the Organic Signature in Dust from the Interstellar Medium: Laboratory Analog Studies

Details Nature of the Organic Signature in Dust from the Interstellar Medium: Laboratory Analog Studies Nature of the Organic Signature in Dust from the Interstellar Medium: Laboratory Analog Studies

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nla..work..204f&link_type=abstract

NASA Laboratory Astrophysics Workshop, held May 1-3 2002 at NASA Ames Research Center, Moffett Field, CA 94035-1000. Publisher:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We measured the infrared (IR) VCH absorption bands around 3.4μm (2800 - 3000cm-1) in large laboratory- grown magnesium oxide (MgO) and natural olivine single crystals that crystallized from CO/C02/H20 saturated melts. These bands are very similar to those from many astronomical sources, such as from dust in the diffuse interstellar medium (ISM) , from the outflow of evolved stars, etc., and they are characteristic of aliphatic -CH2- and -CH3 entities. In our laboratory single crystals the vcH bands arise from C-H entities that were introduced by a solid solution process, and that are imbedded in the mineral matrix in form of polyatomic Cn entities with C atoms bonded to 0 and to H. Heating breaks the C-H bonds, causing hydrogen to disperse in the mineral matrix. C-H bonds are re- established rapidly during annealing. We propose that dnst grains probably contain the same type of internal Cn-H entities in solid matrix rather than an external organic layer covering the grain surfaces. Thermodynamical arguments show that the concentration of organics in solid solution in small grains can be comparable to that found in astronomical environments.

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