VUV PHOTOLYSIS OF CO ICES AT 10 K- A Detailed Study Employing Different Light Sources

Details VUV PHOTOLYSIS OF CO ICES AT 10 K- A Detailed Study Employing Different Light Sources VUV PHOTOLYSIS OF CO ICES AT 10 K- A Detailed Study Employing Different Light Sources

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6208w&link_type=abstract

American Astronomical Society, DPS meeting #38, #62.08; Bulletin of the American Astronomical Society, Vol. 38, p.606

Astronomy and Astrophysics

Astronomy

Scientific paper

Experimental results on the VUV photolysis of pure CO ices at 10 K have been obtained by employing a narrow bandwidth (fwhm = 1.1 nm) synchrotron radiation light source at the National Synchrotron Radiation Research Center, Hsinchu, Taiwan, and a microwave discharge hydrogen-flow lamp in our laboratory to provide the 121.6 nm radiation. The microwave discharge hydrogen-flow lamp is known to provide intense photon intensity at the hydrogen Lyman-α line (121.6 nm). However, it is also known that its photon flux and the spectral distributions strongly depend on the operating conditions, namely the microwave power output and, especially, the hydrogen pressure. Different experimental results on the photolysis of ice systems at low temperatures have been reported by various research groups. In the present study we have used pure CO ices as a case study and have measured the production yields of photon-induced chemical products and the destruction yield of the parent CO molecules using Fourier Transform Infrared spectrometry. The results obtained in this study are compared with previously reported values. We show that the disagreements among the reported values have been mainly caused by the different outputs of the microwave discharge lamp. 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 and the NASA Planetary Atmospheres Program under Grant NAG5-11960.

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