EUV Photosynthesis in Ices Analogus

Details EUV Photosynthesis in Ices Analogus EUV Photosynthesis in Ices Analogus

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p52a..05w&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #P52A-05

Physics

6005 Atmospheres: Composition And Chemistry, 6040 Origin And Evolution, 6045 Physics And Chemistry Of Materials, 6055 Surfaces And Interiors, 6060 Radiation And Spectra

Scientific paper

Experimental results on the spectral identification of new IR absorption features produced through EUV photon-induced chemical reactions in the cometary-type ices and icy satellites of planetary systems are obtained. We have carried out such measurements on CO2-H2O mixed ices, H2O-CH4 mixed ices, and H2O-C2H2 mixed ices at 10 K. A tunable intense synchrotron radiation light source available at the Synchrotron Radiation Research Center, Hsinchu, Taiwan, was employed to provide the required EUV-VUV photons. In this study the photon wavelengths used to irradiate the icy samples were selected to center at the prominent solar lines, namely, the 121.6 nm, 58.4 nm, and 30.4 nm. New molecular species were produced in the ice samples as a result of EUV photon irradiation. The new molecules identified were mainly H2CO3, H2CO, HCO, C2H6, C3H8, CO2, CO, CH3OH, and C2H5OH. While new molecular species were formed, the original reactants were depleted, as expected. The results obtained are essential to the understanding of chemical evolution and synthesis in ice analogues found, for example, in comets, icy satellites of planetary systems, the interstellar medium, molecular clouds, and protostellar regions. The detailed results of this work will be presented.

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