Interstellar grain chemistry and organic molecules

Details Interstellar grain chemistry and organic molecules Interstellar grain chemistry and organic molecules

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3061..113a&link_type=abstract

In its Carbon in the Galaxy: Studies from Earth and Space p 113-146 (SEE N90-27562 21-88)

Astronomy and Astrophysics

Astronomy

1

Chemical Evolution, Comets, Cosmic Dust, Ice, Interstellar Chemistry, Molecular Clouds, Molecules, Organic Chemistry, Organic Materials, Absorption Spectra, Ammonia, Astronomy, Deuterium Compounds, Infrared Absorption, Irradiation, Methane, Methyl Alcohol, Nitrogen, Oxygen, Spectroscopy, Surface Reactions, Vapor Phases

Scientific paper

The detection of prominant infrared absorption bands at 3250, 2170, 2138, 1670 and 1470 cm(-1) (3.08, 4.61, 4.677, 5.99 and 6.80 micron m) associated with molecular clouds show that mixed molecular (icy) grain mantles are an important component of the interstellar dust in the dense interstellar medium. These ices, which contain many organic molecules, may also be the production site of the more complex organic grain mantles detected in the diffuse interstellar medium. Theoretical calculations employing gas phase as well as grain surface reactions predict that the ices should be dominated only by the simple molecules H2O, H2CO, N2, CO, O2, NH3, CH4, possibly CH3OH, and their deuterated counterparts. However, spectroscopic observations in the 2500 to 1250 cm(-1)(4 to 8 micron m) range show substantial variation from source reactions alone. By comparing these astronomical spectra with the spectra of laboratory-produced analogs of interstellar ices, one can determine the composition and abundance of the materials frozen on the grains in dense clouds. Experiments are described in which the chemical evolution of an interstellar ice analog is determined during irradiation and subsequent warm-up. Particular attention is paid to the types of moderately complex organic materials produced during these experiments which are likely to be present in interstellar grains and cometary ices.

Affiliated with

Also associated with

No associations

Rating

Interstellar grain chemistry and organic molecules does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Interstellar grain chemistry and organic molecules, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interstellar grain chemistry and organic molecules will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1382395