Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6209n&link_type=abstract
American Astronomical Society, DPS meeting #38, #62.09; Bulletin of the American Astronomical Society, Vol. 38, p.607
Astronomy and Astrophysics
Astronomy
Scientific paper
We wish to report our experimental results on the spectral identification of IR absorption features produced through EUV-VUV photon-induced chemical reactions in the cometary-type ices and icy satellites of planetary systems. The mixed ice systems studied in the present work are CO+NH3 mixed ices in two different compositions, (1:1) and (4:1), H2O+NH3+CO (1:1:1) mixed ices, and CH4+NH3+CO (1:1:1) mixed ices at 10 K. A tunable intense synchrotron radiation light source available at the National 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 30.4 nm, 58.4 nm, and 121.6 nm. New chemical species were produced in the ice samples at 10 K as a result of EUV-VUV photolysis. The new molecules identified include CO2, HCN, OCN, HNCO, NH4+, HCO, H2CO, and H2CO3. We have measured the production yields as well as the destruction yields (half life) of the parent CO and NH3 molecules in the ices systems. The results obtained from the present study are important to our further understanding of chemical synthesis in ice analogs. The detailed results of this work will be presented. This research is based on work supported by the NSF Planetary Astronomy Program under Grant AST-0604455.
Judge Darrell L.
Nguyen Tran B.
Wu Chang-Rui
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