title: Mid- and far-infrared spectroscopy of ices:  optical constants and integrated absorbances.
abstract: Laboratory spectra through the mid-infrared (4000 to 500 cm-1 [2.5-20 micrometers]) have been used to calculate the optical constants (n and k) and integrated absorption coefficients (A) for a variety of pure and mixed molecular ices of relevance to astrophysics.  The ices studied were H2O, CH3OH, CO2, OCS, CH4, CO2 + CH4, CO2 + OCS, CO + CH4, CO + OCS, O2 + CH4, O2 + OCS, N2 + CH4, N2 + OCS, H2O + CH4, H2O + OCS, and H2O + CH3OH + CO + NH3.  In addition, the measurements have been extended through the far-infrared (500 to 50 cm-1 [20-200 micrometers]) for the H2O, CH3OH, and H2O + CH3OH + CO + NH3 ices.
authors.affiliation: NASA/Ames Research Center, Moffett Field, CA 94035, USA.
authors.forename: D M
authors.initials: DM
authors.lastname: Hudgins
authors.forename: S A
authors.initials: SA
authors.lastname: Sandford
authors.forename: L J
authors.initials: LJ
authors.lastname: Allamandola
authors.forename: A G
authors.initials: AG
authors.lastname: Tielens
mesh_terms: D001256:Astronomy / Q000295:instrumentation* / Q000379:methods; D005118:Extraterrestrial Environment; D007053:Ice / Q000032:analysis*; D008956:Models, Chemical; D055095:Optics and Photonics; D012031:Refractometry; D017550:Spectroscopy, Fourier Transform Infrared / Q000295:instrumentation*; D013696:Temperature
chemical_list: D007053:Ice