Infrared absorption in the region of 3450 cm−1 has been observed in water–rare-gas matrices subjected to vacuum-ultraviolet photolysis at 20.4° and 4.2°K. The splittings and isotope frequency ratios obtained from H216O–D216O, H216O–H218O, and D216O–D218O mixtures lead to the assignment of these spectra to trapped OH radicals. No evidence for rotational motion of OH is found in these experiments.

No abstract

Light emission from rare gas solids containing small amounts of oxygen has been excited by an electron bombardment technique. The Herzberg bands of oxygen and a line group believed to be the 1S→1D transition of the neutral oxygen atom form the strongest features of the observed spectra. In a neon matrix, the Second Negative system of O2+ has been identified. The effect of the various solids on the vibrational structure of the Herzberg bands is discussed.

The activation energies and steric factors of the abstraction reactions D+D2CO→D2+DCO and D+CH4→HD+CH3 have been determined by the technique of competing reactions. Mixtures of formaldehyde-d2 and H2 as well as formaldehyde-d2 and methane were photolyzed over a temperature interval in the region of 350°. Measurements of the HD/D2 product ratios as a function of temperature, initial compositions, and light intensity, give the activation energies and steric factors for D+D2CO→D2+DCO, the values E=4.8±0.6 kcal, P=0.04, and for D+CH4→HD+CH3, the values E=7.8±0.6 kcal, P=0.025. These are based on the values E=5.4 kcal and P=0.11 for the reaction D+H2→HD+H.

No abstract