HR: 0830h
AN: V31D-0962    [PDF]
TI: Liquids in the Diamond Anvil Cell: High Pressure-Temperature Chemistry of Formic Acid
AU: * Montgomery, W B
EM: wren@eps.berkeley.edu
AF: Department of Earth and Planetary Science, University of California, Berkeley, 307 McCone Hall #4767, Berkeley, CA 94720-4767 United States
AU: Zaug, J M
EM: zaug1@llnl.gov
AF: Chemistry and Material Science, Lawrence Livermore National Laboratory, L-282 7000 E. Ave, Livermore, CA 94551 United States
AU: Goncharov, A F
EM: goncharov1@llnl.gov
AF: Chemistry and Material Science, Lawrence Livermore National Laboratory, L-282 7000 E. Ave, Livermore, CA 94551 United States
AU: Howard, W M
EM: howard11@llnl.gov
AF: Chemistry and Material Science, Lawrence Livermore National Laboratory, L-282 7000 E. Ave, Livermore, CA 94551 United States
AU: Manaa, M R
EM: manaa1@llnl.gov
AF: Chemistry and Material Science, Lawrence Livermore National Laboratory, L-282 7000 E. Ave, Livermore, CA 94551 United States
AU: Jeanloz, R
EM: jeanloz@uclink.berkeley.edu
AF: Department of Earth and Planetary Science, University of California, Berkeley, 307 McCone Hall #4767, Berkeley, CA 94720-4767 United States
AU: Young, C E
EM: young74@llnl.gov
AF: Department of Chemical Engineering and Material Sciences, University of California, Davis, 1 Shields Ave, Davis, CA 95616-5294 United States
AU: Crowhurst, J C
EM: crowhurst1@llnl.gov
AF: Chemistry and Material Science, Lawrence Livermore National Laboratory, L-282 7000 E. Ave, Livermore, CA 94551 United States
AB: The chemical and physical properties of liquids under high pressures and temperatures are of continuing interest and application to the planetary science community. Using near-simultaneous FTIR and Raman spectroscopy including high-resolution optical video, we have begun to study the behavior of formic acid (HCOOH) at conditions observed on Europa, Ganymede and Callisto. We present a phase diagram, including melting curve, proposed reaction mechanisms and solid-state phase transitions, over a temperature range from 300-550 K and a pressure range from .1 to 9 GPa. Reaction products, including CO$_{2}$ and amorphous carbons (COOH$_{n}$) have been identified. Preliminary results from FTIR studies are used to determine reaction rates, and pressure dependent activation energies. We have also employed a detailed kinetic reaction mechanism to study the decomposition of formic acid at extreme conditions by using a fluid exponential-6 equation-of-state for the reacting species. We have used first principles DFT and semi-empirical tight binding methods to predict properties of solid formic acid under isotropic and uniaxial compression. We compare the results of both simulations to our experimental observations.
DE: 3672 Planetary mineralogy and petrology (5410)
DE: 3924 High-pressure behavior
DE: 3934 Optical, infrared, and Raman spectroscopy
DE: 6218 Jovian satellites
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting