Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices

Details Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices

2006-10-25

arxiv.org/abs/astro-ph/0610751v1

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, accepted by A&A

Scientific paper

H2O is the most abundant component of astrophysical ices. In most lines of sight it is not possible to fit both the H2O 3 um stretching, the 6 um bending and the 13 um libration band intensities with a single pure H2O spectrum. Recent Spitzer observations have revealed CO2 ice in high abundances and it has been suggested that CO2 mixed into H2O ice can affect relative strengths of the 3 um and 6 um bands. We used laboratory infrared transmission spectroscopy of H2O:CO2 ice mixtures to investigate the effects of CO2 on H2O ice spectral features at 15-135 K. We find that the H2O peak profiles and band strengths are significantly different in H2O:CO2 ice mixtures compared to pure H2O ice. In all H2O:CO2 mixtures, a strong free-OH stretching band appears around 2.73 um, which can be used to put an upper limit on the CO2 concentration in the H2O ice. The H2O bending mode profile also changes drastically with CO2 concentration; the broad pure H2O band gives way to two narrow bands as the CO2 concentration is increased. This makes it crucial to constrain the environment of H2O ice to enable correct assignments of other species contributing to the interstellar 6 um absorption band. The amount of CO2 present in the H2O ice of B5:IRS1 is estimated by simultaneously comparing the H2O stretching and bending regions and the CO2 bending mode to laboratory spectra of H2O, CO2, H2O:CO2 and HCOOH.

Affiliated with

Also associated with

No associations

Rating

Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 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 Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-378004