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The formation and stability of carbonic acid on outer Solar System bodies |
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| Authors: | Z Peeters RL Hudson MH Moore |
| Institution: | a Code 691, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States b Department of Chemistry, The Catholic University of America, Washington, DC 20064, United States c Department of Chemistry, Eckerd College, St. Petersburg, FL 33711, United States |
| Abstract: | The radiation chemistry, thermal stability, and vapor pressure of solid-phase carbonic acid (H2CO3) have been studied with mid-infrared spectroscopy. A new procedure for measuring this molecule’s radiation stability has been used to obtain intrinsic IR band strengths and half-lives for radiolytic destruction. We report, for the first time, measurements of carbonic acid’s vapor pressure (0.290-2.33 × 10−11 bar for 240-255 K) and its enthalpy of sublimation (71 ± 9 kJ mol−1). We also report the first observation of a chemical reaction involving solid-phase carbonic acid. Possible applications of these findings are discussed, with an emphasis on the outer Solar System icy surfaces. |
| Keywords: | Ices IR spectroscopy Satellites Surfaces Cosmic rays |
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