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Title:
Production and optical constraints of ice tholin from charged particle irradiation of (1:6) C2H6/H2O at 77 K
Authors:
Khare, B. N.; Thompson, W. R.; Cheng, L.; Chyba, C.; Sagan, C.; Arakawa, E. T.; Meisse, C.; Tuminello, P. S.
Affiliation:
AA(Cornell Univ., Ithaca, NY), AB(Cornell Univ., Ithaca, NY), AC(Cornell Univ., Ithaca, NY), AD(NASA, Goddard Space Flight Center, Greenbelt, MD), AE(Cornell Univ., Ithaca, NY), AF(Oak Ridge National Lab., TN), AG(Oak Ridge National Lab., TN), AH(Oak Ridge National Lab., TN)
Publication:
Icarus (ISSN 0019-1035), vol. 103, no. 2, p. 290-300. (Icarus Homepage)
Publication Date:
06/1993
Category:
Astrophysics; Comets
Origin:
STI
NASA/STI Keywords:
COMET NUCLEI, ICE, INTERSTELLAR MATTER, OPTICAL PROPERTIES, ORGANIC MATERIALS, CHARGED PARTICLES, INFRARED SPECTROSCOPY, IRRADIATION, THIN FILMS
Keywords:
COMETS, ICY BODIES, ICE, THOLIN, OPTICAL PROPERTIES, ORIGIN, FORMATION, CHARGED PARTICLES, IRRADIATION, WATER, ETHANE, SPECTRA, RESIDUE, ENERGY, LABORATORY STUDIES, PROCEDURE, REFRACTIVE INDEX, SPECTROMETRY, EQUIPMENT, WAVELENGTH, CALCULATIONS, INFRARED, ABSORPTION, REFLECTANCE, DIELECTRIC CONSTANT
DOI:
10.1006/icar.1993.1071
Bibliographic Code:
1993Icar..103..290K

Abstract

Fifty separate irradiations of a 6:1 mixture of H2O/C2H6 ice conducted over a 5-month period have yielded sufficient tholin for the determination of its physical constants in the 0.06 to 40 micron range. While the imaginary part of the refractive index k was obtained by transmission measurements on thin-film samples and Kramers-Kronig analysis (KKA), the real part of the refractive index was obtained by KKA and ellipsometry; these data may prove useful in cometary and outer solar system spectrometric interpretation.
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