Infrared Spectra of Products of the Reaction of H Atoms with O sub(2) Trapped in Solid Neon: HO sub(2), HO sub(2) super(+), HOHOH super(-), and H sub(2)O(HO)

When a Ne/O sub(2) mixture is codeposited at 4.3 K with a Ne/H sub(2) mixture that has been passed through a microwave discharge, the infrared spectrum of the resulting deposit includes prominent absorptions of the three vibrational fundamentals of HO sub(2) and seven relatively weak absorptions in the infrared and near-infrared, only one of them previously reported, that can be assigned to overtones and combination bands of that product. Similar assignments are made for DO sub(2). A new, broad absorption at 702.9 cm super(-1) appears close to the gas-phase absorption of HOHOH super(-) at 697 cm super(-1). Isotopic substitution experiments support that assignment. Evidence is also presented for the stabilization of HOHO super(-). Absorptions near the vibrational fundamentals of H sub(2)O and an absorption at 3472.4 cm super(-1) grow on exposure of the deposit to radiation of wavelength shorter than 345 nm. These absorptions are assigned to the H sub(2)O(HO) complex, in agreement with the results of an earlier argon-matrix study. In both studies, photodestruction of HO sub(2) molecules that have H sub(2)O trapped in a nearby site results in formation of the complex. Because the discharge through Ne/H sub(2) supports ion production, photodetachment of the resulting HOHOH super(-) is an additional source of the complex. Other absorptions may be contributed by the bending fundamental of HO sub(2) super(+) and by a cation complex with H sub(2).