title: Infrared detection of HO2 and HO3 radicals in water ice.
abstract: Infrared spectroscopy has been used to detect HO(2) and HO(3) radicals in H(2)O + O(2) ice mixtures irradiated with 0.8 MeV protons. In these experiments, HO(2) was formed by the addition of an H atom to O(2) and HO(3) was formed by a similar addition of H to O(3). The band positions observed for HO(2) and HO(3) in H(2)O-ice are 1142 and 1259 cm(-1), respectively, and these assignments were confirmed with (18)O(2). HO(2) and HO(3) were also observed in irradiated H(2)O + O(3) ice mixtures, as well as in irradiated H(2)O(2) ice. The astronomical relevance of these laboratory measurements is discussed.
authors.affiliation: NASA/Goddard Space Flight Center, Astrochemistry Branch, Code 691, Greenbelt, MD 20771, USA. paul.cooper@ssedmail.gsfc.nasa.gov
authors.forename: Paul D
authors.initials: PD
authors.lastname: Cooper
authors.forename: Marla H
authors.initials: MH
authors.lastname: Moore
authors.forename: Reggie L
authors.initials: RL
authors.lastname: Hudson