The Near-IR Band Strengths of Molecules in N2 and H2O Ices

Details The Near-IR Band Strengths of Molecules in N2 and H2O Ices The Near-IR Band Strengths of Molecules in N2 and H2O Ices

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.4912r&link_type=abstract

American Astronomical Society, DPS meeting #40, #49.12; Bulletin of the American Astronomical Society, Vol. 40, p.487

Astronomy and Astrophysics

Astrophysics

Scientific paper

In order to determine the column density of an ice component, the band strength of an absorption feature must be known. The sizes of near-IR features can be correlated with a previously studied mid-IR feature whose band strength is already known. Molecules in mixtures may affect position, FWHM, shapes and intensities of absorption peaks, as well as band strength. Many satellites within the solar system have surfaces are dominated by either N2 or H2O (Review by Roush 2001). It has already been shown that for CH4 and CO isolated in N2 the peak positions will be shifted, and width and peak intensities will be altered in comparison to pure ice spectra (Quirico et al. 1999). The experiments here focus on changes in band strength, intensity, FWHM, and positioning for N2 mixed with CO, CO2, CH4, NH3, and H2O in 5:1 ratios and H2O mixed with CO, CO2, CH4, NH3, and N2 in 5:1 ratios and is a continuation of previous results published by the Astro- and Solar-System Program at UAB (Gerakines et. al. 2005). These data may be used to determine ice abundances from observed near-IR spectra or to predict the sizes of near-IR features in astrophysical environments.

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