Mercury photosensitized production of free radicals in organic glasses

Journal Article · Thu May 19 04:00:00 EDT 1977 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100525a011· OSTI ID:7209025

Brown, B J; Willard, J E

Knowledge of the mechanism of the Hg photosensitized production of trapped radicals in 3-methylpentane glass has been extended by investigation of the effects of light intensity (234 and 200 to 300 nm) and of temperature (5 to 77/sup 0/K) on the rates of radical production. At 77/sup 0/K the Hg is removed by 254-nm light with a quantum yield near unity, producing a nonparamagnetic Hg species. Continuing radical production occurs by photoactivated reaction of this species. Competing reactions involve one or more other intermediates, the relative roles of which are governed by the light intensity, wavelength, and temperature. Many of the radicals are produced in configurations such that their ESR sensitivity changes reversibly with temperature in the range between 5 and 45/sup 0/K, the apparent radical concentration being several fold higher at the higher temperature.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 7209025
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 81:10; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKANES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRON SPIN RESONANCE
GLASS
HYDROCARBONS
KINETICS
LOW TEMPERATURE
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
REACTION KINETICS
RESONANCE
VERY LOW TEMPERATURE