J/ApJ/701/1347 Optical constants of H2O-ice (Mastrapa+, 2009)
Optical constants of amorphous and crystalline H2O-ice:
2.5-22 µm (4000-455/cm) optical constants of H2O-ice.
Mastrapa R.M., Sandford S.A., Roush T.L., Cruikshank D.P., Dalle Ore C.M.
<Astrophys. J., 701, 1347-1356 (2009)>
=2009ApJ...701.1347M 2009ApJ...701.1347M
ADC_Keywords: Interstellar medium; Spectra, infrared
Keywords: astrochemistry - infrared: solar system - interplanetary medium -
methods: laboratory - planets and satellites: general
Abstract:
Using new laboratory spectra, we have calculated the real and
imaginary parts of the index of refraction of amorphous and
crystalline H2O-ice from 20-150K in the wavelength range 2.5-22um
(4000-455cm-1) and joined these results with previous measurement
from 1.25 to 2.5um. These optical constants improve on previous
measurements by having better temperature and spectral resolution and
can be used to create model spectra for comparison to spectra of solar
system objects and interstellar materials. In this wavelength range,
the infrared band shapes and positions of amorphous H2O-ice are
strongly dependent on deposition temperature. Amorphous and
crystalline H2O-ice have distinctive spectral bands at all
wavelengths in this region with bands weakening and shifting to
shorter wavelength in amorphous H2O-ice compared to crystalline
H2O-ice. Some notable exceptions are the band near 6um, which is
stronger in amorphous H2O-ice, and the bands near 4.5um and 12.5um,
which shift to longer wavelength in amorphous H2O-ice.
Description:
The vacuum system used in this work has remained unchanged since its
last detailed description (Hudgins et al. 1993, Cat. J/ApJS/86/713;
Bernstein et al. 2006Icar..181..302B 2006Icar..181..302B; Mastrapa et al.
2008Icar..197..307M 2008Icar..197..307M). We collect infrared transmission spectra of ice
samples under high vacuum (10-8mbar) and low temperatures (15K).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 51 191783 Optical constants
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See also:
J/ApJS/191/96 : IR spectra and optical constants of nitril ices (Moore+, 2010)
J/ApJ/678/985 : c2d Spitzer survey of interstellar ices. I. (Boogert+, 2008)
J/ApJS/86/713 : IR spectroscopy of ices (Hudgins+, 1993)
Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Form H2O-ice form (Amorphous or Crystalline)
13- 15 I3 K Temp [15/150] Temperature
17- 26 F10.7 um lambda [1.11/22.23] Wavelength λ
28- 37 F10.8 --- n Real part of the index of refraction
39- 51 E13.7 --- k Imaginary part of the index of refraction
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History:
From electronic version of the journal
References:
Mastrapa et al. H2O-ice from 1.1 to 2.6um. 2008Icar..197..307M 2008Icar..197..307M
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 23-Sep-2011