The perturbation of near IR optical features of water ice induced by frozen acids, brines and organic polymers.

Details The perturbation of near IR optical features of water ice induced by frozen acids, brines and organic polymers. The perturbation of near IR optical features of water ice induced by frozen acids, brines and organic polymers.

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p11d0807o&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P11D-0807

Physics

5410 Composition (1060, 3672), 5422 Ices, 5470 Surface Materials And Properties

Scientific paper

We report the temperature and pH dependencies of the near IR optical signatures of low-temperature ice containing acids, brines or tholins. In the case of flash frozen acids and brines, the 1.5 and 2 micron features shift in wavelength and broaden primarily due to the presence of solvated protons. The role of protons can be seen most dramatically when examining the dissolution of sulfuric acid in ice. Specifically, at temperatures below 135 K, the second pKa of sulfuric acid increases as the temperature decreases due to the increased coupling of the SO42- with the surrounding water molecules. These shifts and broadening are also inherent in the dissolution of MgSO4 or Na2SO4, two candidate materials possibly present in the non-ice regions of Europa. We also compare the optical signatures of organic polymers (tholins) created by discharge devices vs. those created photochemically. The relevance of this work to Titan's surface composition is discussed.

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