Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..mar.k1203d&link_type=abstract
American Physical Society, March Meeting 2004, March 22-26, 2004, Palais des Congres de Montreal, Montreal, Quebec, Canada, MEET
Astronomy and Astrophysics
Astrophysics
Scientific paper
The investigation of simple ices and ice mixtures and the photochemical processes that can occur in these ices have important applications in atmospheric physics, astrophysics, and planetary astronomy. In this study, carbon dioxide ices and various mixtures are grown using a closed cycle helium cryostat. The ices are characterized using x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR), and the chemical changes are monitored while the solids are irradiated with x-rays for periods of up to six hours. A quadrapole mass spectrometer was also used to monitor the gas phase species evolving from the ice surface during the photoprocessing. The XPS and FTIR results are presented and correlated. It is noted that significant differences are observed, particularly for the time dependence of the evolution of the gas phase molecules, between ices grown at 77 K as compared to those grown at 20 K.
Cornelison David
Dillingham Randy T.
Martin Joshua
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