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.

Stability of the Hydrogen Trioxy Radical via Infrared Action Spectroscopy

“…4,5 The most revealing information thus far comes from the Fourier transform microwave (FTMW) spectroscopy work of Suma et al, 6 who measured the rotational spectrum and derived the structure of trans-HO 3 . However, the stability of HO 3 remains the subject of considerable uncertainty.…”

Peroxide intermediates of oxidation processes: Organic trioxides

“…Under conditions that stabilize the trioxy intermediate, the formation of hydrotrioxides is assumed 14,57,58 to involve HOOO • (and/or its conjugate anion HOOO − ) (Scheme 6). At low temperatures, the hydrotrioxy radical is accumulated in detectable amounts upon electron 39 or proton 59 …”

Gas-surface interactions and heterogeneous chemistry on interstellar grains analogues

“…Tielens and Hagen [1] [1] or by energetic processes [134][135][136][137]. The OH radicals and the O 2 molecule resulting from reaction (6) and/or (7) further lead to H 2 O via reactions (2) or (3) and (4) to (6) respectively.…”