NEAR-INFRARED BAND STRENGTHS OF MOLECULES DILUTED IN N{sub 2} AND H{sub 2}O ICE MIXTURES RELEVANT TO INTERSTELLAR AND PLANETARY ICES

Journal Article · Thu Nov 01 04:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/759/1/74· OSTI ID:22086453

Richey, C R

The relative abundances of ices in astrophysical environments rely on accurate laboratory measurements of physical parameters, such as band strengths (or absorption intensities), determined for the molecules of interest in relevant mixtures. In an extension of our previous study on pure-ice samples, here we focus on the near-infrared absorption features of molecules in mixtures with the dominant components of interstellar and planetary ices, H{sub 2}O and N{sub 2}. We present experimentally measured near-infrared spectral information (peak positions, widths, and band strengths) for both H{sub 2}O- and N{sub 2}-dominated mixtures of CO (carbon monoxide), CO{sub 2} (carbon dioxide), CH{sub 4} (methane), and NH{sub 3} (ammonia). Band strengths were determined during sample deposition by correlating the growth of near-infrared features (10,000-4000 cm{sup -1}, 1-2.5 {mu}m) with better-known mid-infrared features (4000-400 cm{sup -1}, 2.5-25 {mu}m) at longer wavelengths.

• OSTI ID: 22086453
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 759; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABSORPTION
ABUNDANCE
AMMONIA
ASTRONOMY
ASTROPHYSICS
CARBON DIOXIDE
CARBON MONOXIDE
DEPOSITION
ICE
METHANE
MIXTURES
MOLECULES
NEAR INFRARED RADIATION
WATER