Formation and Evolution Processes of Dust: From Circumstellar Organic Molecules to Interstellar Carbonaceous Grains - Bridging Astronomy and Laboratory Astrophysics.

Details Formation and Evolution Processes of Dust: From Circumstellar Organic Molecules to Interstellar Carbonaceous Grains - Bridging Astronomy and Laboratory Astrophysics. Formation and Evolution Processes of Dust: From Circumstellar Organic Molecules to Interstellar Carbonaceous Grains - Bridging Astronomy and Laboratory Astrophysics.

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440203c&link_type=abstract

American Astronomical Society, AAS Meeting #214, #402.03; Bulletin of the American Astronomical Society, Vol. 41, p.662

Astronomy and Astrophysics

Astronomy

Scientific paper

The study of the formation and the destruction processes of cosmic dust is essential to understand and to quantify the budget of extraterrestrial organic molecules. Interstellar dust presents a continuous size distribution from large molecules, radicals and ions to nanometer-sized particles to micron-sized grains. The lower end of the carbonaceous dust size distribution is thought to be responsible for the ubiquitous spectral features that are seen in emission in the IR (UIBs) and in absorption in the visible (DIBs). The higher end of the dust-size distribution is thought to be responsible for the continuum emission plateau that is seen in the IR and for the strong absorption seen in the interstellar UV extinction curve. Although dust with all its components plays an important role in the evolution of interstellar chemistry and in the formation of organic molecules, little is known on the formation and destruction processes of carbon dust. Space observations from the UV (HST) to the IR (ISO, Spitzer) help place size constraints on the molecular component of carbonaceous IS dust and its contribution to the IS features in the UV and in the IR. Studies of large molecular and nano-sized IS dust analogs formed from PAH precursors have been performed in our laboratory under conditions that simulate interstellar and circumstellar environments. The species (molecules, molecular fragments, ions, nanoparticles, etc.) formed in the pulsed discharge nozzle (PDN) plasma source are detected and characterized with a high-sensitivity cavity ringdown spectrometer (CRDS) coupled to a Reflectron time-of-flight mass spectrometer (ReTOF-MS). We will present new experimental results that indicate that nanoparticles are generated in the plasma. From these unique measurements, we derive information on the nature, the size and the structure of interstellar dust particles, the growth and the destruction processes of IS dust and the resulting budget of extraterrestrial organic molecules.

Affiliated with

Also associated with

No associations

Rating

Formation and Evolution Processes of Dust: From Circumstellar Organic Molecules to Interstellar Carbonaceous Grains - Bridging Astronomy and Laboratory Astrophysics. 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 Formation and Evolution Processes of Dust: From Circumstellar Organic Molecules to Interstellar Carbonaceous Grains - Bridging Astronomy and Laboratory Astrophysics., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation and Evolution Processes of Dust: From Circumstellar Organic Molecules to Interstellar Carbonaceous Grains - Bridging Astronomy and Laboratory Astrophysics. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1106463