Diamonds are a PAHs Best Friend

Details Diamonds are a PAHs Best Friend Diamonds are a PAHs Best Friend

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30144a&link_type=abstract

Spitzer Proposal ID #30144

Statistics

Computation

Scientific paper

The mid-IR spectroscopic capabilities and unprecedented sensitivity of the Spitzer Space Telescope has shown that the ubiquitious infrared (IR) emission features can be used as probes of many galactic and extragalactic objects. These features, formerly called the Unidentified Infrared (UIR) Bands, are now generally attributed to the vibrational emission from polycyclic aromatic hydrocarbons, PAHs, and related species. However there is some difficulty in reproducing all the features of the interstellar emission spectrum solely with PAH spectra. Because these differences have persisted as our knowledge of PAH spectroscopy has increased these differences point to at least one other type of contributor to the interstellar emission spectrum. The association of these features with objects abundant in cosmic carbon points to an additional carbonaceous material contributing to the features. Among the possibilities diamonds are particularly attractive. However, until very recently, this could not be tested because well-characterized microdiamonds were not available for study. These are now available for purchase from ChevronTexaco. We propose to use the matrix isolation technique to measure the 0.7 to 20 µm spectra of astrophysically relevant, cold microdiamonds. We will also develop and apply the computational techniques required to calculate these spectra and the spectra of microdiamonds for which we cannot obtain samples. Given the lack of availability of microdiamonds until recently, their IR spectroscopic properties are not known. Since microdiamonds have been long thought to be present throughout the ISM this lack of spectroscopic information prevents a complete analysis of Spitzer data, especially in the 7 to 8 µm region. These data will be made available to the astronomical community. Incorporating these new data into existing models will improve their ability to probe conditions such as radiation field, charge state, electron and hydrogen density, and cosmochemical history of the object.

Affiliated with

Also associated with

No associations

Rating

Diamonds are a PAHs Best Friend 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 Diamonds are a PAHs Best Friend, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diamonds are a PAHs Best Friend will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-933135