Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing

Details Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phdt........33w&link_type=abstract

ProQuest Dissertations And Theses; Thesis (Ph.D.)--The University of Alabama at Birmingham, 2010.; Publication Number: AAT340784

Computer Science

Databases

Scientific paper

Solid CO2 has been detected in many lines of sight in the interstellar medium from infrared observatories. Spectral profiles from space-based observatories have suggested that CO2 on icy grain mantles is mixed with other common molecules such as H2O and CH 3OH in interstellar regions and that thermal annealing has occurred. The vibrational mode at 658 cm-1 (15.2 mum) is suspected to be a powerful diagnostic tool as to the composition of species on icy grain mantles as well as thermal histories. However, previous studies have not systematically investigated ice composition and temperature. Laboratory spectra of interstellar ice analogs have been created in this study order to better understand the physical properties of solid CO2 in these interstellar environments. Existing databases of ice composition studies and effects of ice thermal history were updated in this study to include a more systematic approach. The 658 cm-1 (15.2 mum) bending mode feature of CO2 is examined here and the subsequent astrophysical implications stated. In the first set of experiments, 47 mixtures of H2O,CH3OH, andCO2 were slowly warmed and mid-infrared absorption spectra were recorded at 5K intervals. The second set of experiments involved examining the CO2 bending mode feature of 10 different CO2-containing ice mixtures at different temperatures where ice segregation was suspected. In these experiments, the ice mixtures were slowly heated to the desired temperature for increasing time intervals before cooling down and recording mid-IR absorption spectra. These studies may be used to analyze IR data from space-based observatories such as the Spitzer Space Telescope Infrared Spectrograph as well other future IR observations of the interstellar medium. Finally, mass spectroscopy measurements were taken from temperature programmed desorption (TPD) experiments performed on several binary mixtures of H2O + CO2 and CH 3OH + CO2. Physical properties such as desorption energy of CO2 can be determined from the TPD traces of these experiments. The work provided here addresses the physical properties of solid CO 2 thermally processed in ice mixtures in interstellar environments by laboratory simulations spectroscopically analyzed by mid-infrared absorption profiles and TPD.

Affiliated with

Also associated with

No associations

Rating

Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing 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 Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1520777