Facile Generation and Storage of Polycyclic Aromatic Hydrocarbon Ions in Astrophysical Ices

Details Facile Generation and Storage of Polycyclic Aromatic Hydrocarbon Ions in Astrophysical Ices Facile Generation and Storage of Polycyclic Aromatic Hydrocarbon Ions in Astrophysical Ices

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...596l.195g&link_type=abstract

The Astrophysical Journal, Volume 596, Issue 2, pp. L195-L198.

Astronomy and Astrophysics

Astronomy

21

Astrochemistry, Comets: General, Ism: Dust, Extinction, Ism: Molecules, Methods: Laboratory, Molecular Processes

Scientific paper

In situ ultraviolet-visible absorption and emission studies of vacuum ultraviolet (VUV) irradiated water-rich, cosmic ice analogs containing polycyclic aromatic hydrocarbons (PAHs) are described. VUV irradiation of 12 K water ices containing the PAHs naphthalene (H2O/C10H8 = 200) and 4-methylpyrene (H2O/C17H12 > 500) readily converts the PAHs into their cation form (PAH+). Under these conditions, PAH photoionization is the predominant reaction. These ions are trapped and stored in the ices at temperatures between 10 and 50 K, a temperature domain common to ices throughout interstellar clouds and the solar system. Unlike the ~15% ionization typical after VUV irradiation of PAHs isolated in rare-gas matrices, in water ice, PAH photoionization and storage proceed efficiently and almost quantitatively with a greater than 70% ionization yield. As the temperature is increased from 50 to 150 K, the PAH ion bands slowly diminish as the PAH ions ultimately react to form more complex organic species involving the water host. The chemical, spectroscopic, and physical properties of these ion-rich ices can be important in icy objects such as molecular clouds, comets, and planets. Several astrophysical applications are presented.

Affiliated with

Also associated with

No associations

Rating

Facile Generation and Storage of Polycyclic Aromatic Hydrocarbon Ions in Astrophysical Ices 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 Facile Generation and Storage of Polycyclic Aromatic Hydrocarbon Ions in Astrophysical Ices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Facile Generation and Storage of Polycyclic Aromatic Hydrocarbon Ions in Astrophysical Ices will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-913616