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Title: X-RAY IRRADIATION OF H{sub 2}O + CO ICE MIXTURES WITH SYNCHROTRON LIGHT

We irradiated a (4:1) mixture of water and carbon monoxide with soft X-rays of energies up to 1.2 keV. The experiments were performed using the spherical grating monochromator beamline at National Synchrotron Radiation Research Center in Taiwan. Both monochromatic (300 and 900 eV) and broader energy fluxes (250–1200 eV) were employed. During the irradiation, the H{sub 2}O + CO mixture was ionized, excited, and fragmented, producing a number of reactive species. The composition of the ice has been monitored throughout both the irradiation and warm-up phases. We identified several products, which can be related through a plausible chemical reaction scheme. Such chemistry is initiated by the injection of energetic photoelectrons that produce multiple ionization events generating a secondary electron cascade. The results have been discussed in light of a model for protoplanetary disks around young solar-type stars.
Authors:
; ; ;  [1] ; ;  [2]
  1. INAF–Osservatorio Astronomico di Palermo, P.za Parlamento 1, I-90134 Palermo (Italy)
  2. Department of Physics, National Central University, Jhongli District, Taoyuan City 32054, Taiwan (China)
Publication Date:
OSTI Identifier:
22518575
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 820; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON MONOXIDE; CHEMICAL REACTIONS; CHEMISTRY; ELECTRONS; EV RANGE; ICE; IONIZATION; IRRADIATION; KEV RANGE; MAIN SEQUENCE STARS; MIXTURES; MOLECULES; MONOCHROMATIC RADIATION; PROTOPLANETS; SOFT X RADIATION; VISIBLE RADIATION; WATER