Physics – Geophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p13c0187m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P13C-0187
Physics
Geophysics
5464 Remote Sensing, 6020 Ices, 6224 Kuiper Belt Objects, 6285 Trans-Neptunian Objects, 6297 Instruments And Techniques
Scientific paper
We have used the infrared spectra of laboratory ices to calculate the real and imaginary indices of refraction for amorphous and crystalline H2O-ice. We create H2O-ice samples in vacuum (~10e-8 Torr) by condensing gases onto a cold substrate (15-150 K). We measure the thickness of the sample by reflecting a He-Ne laser off of the sample and counting interference fringes as it grows and then collect transmission spectra of the samples in the wavelength range 1.25-22 microns. Using the ice thickness and transmission spectrum we calculate the imaginary part of the index of refraction. A Kramers-Kronig calculation is then used to calculate the real part of the index of refraction (Berland et al. 1994; Hudgins et al. 1993). These optical constants can be used to create model spectra for comparison to spectra from Solar System objects. We will summarize the differences between the amorphous and crystalline H2O-ice spectra. These include weakening of features and shifting of features to shorter wavelength in amorphous H2O-ice spectra. We will also discuss methods of using band area ratios to quickly estimate the fraction of amorphous to crystalline H2O-ice. We acknowledge financial support from the NASA Origins of the Solar System Program, the NASA Planetary Geology and Geophysics Program, and the NASA Postdoctoral Program. Berland, B. S., Haynes, D. R., Foster, K. L., Tolbert, M. A., George, S. M., Toon, O. B., 1994. Refractive Indices of Amorphous and Crystalline HNO3/H2O Films Representative of Polar Stratospheric Clouds. J. Phys. Chem. 98, Hudgins, D., Sandford, S. A., Allamandola, L. J., Tielens, A. G. G. M., 1993. Mid- and Far-Infrared Spectroscopy of Ices: Optical Constants and Integrated Absorbances. Astrophys. J. Suppl. Ser. 86, 713-870.
Bernstein Max P.
Mastrapa Rachel M.
Sandford Scott A.
No associations
LandOfFree
New Optical Constants for Amorphous and Crystalline H2O-ice 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 New Optical Constants for Amorphous and Crystalline H2O-ice, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Optical Constants for Amorphous and Crystalline H2O-ice will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-961080