EUV-UV Photon-Induced Chemical Reactions in Mixed Ices System at 10 K

Details EUV-UV Photon-Induced Chemical Reactions in Mixed Ices System at 10 K EUV-UV Photon-Induced Chemical Reactions in Mixed Ices System at 10 K

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.5602w&link_type=abstract

American Astronomical Society, DPS Meeting #33, #56.02; Bulletin of the American Astronomical Society, Vol. 33, p.1141

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Scientific paper

Experimental results on the spectral identification of new IR absorption features produced through EUV-UV photon-induced chemical reactions in the cometary-type ices and icy satellites of planetary systems are obtained. We have carried out such measurements on H2O-CH4 mixed ices, H2O-C2H2 mixed ices, CO2-H2O mixed ices as well as the pure C2H2 ices. 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-VUV photon irradiation at 10 K. The new molecules identified were mainly C2H6, CO2, CO, CH3OH, and H2CO. In addition, we have tentatively assigned several unidentified absorption features to HCO, C3H8 and C2H5OH. However, further study is warranted. While new molecular species were formed, the original reactants, namely, H2O, CH4, C2H2, and CO2, were depleted due to their conversion to other species. The detailed results of this work will be presented.

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