Mercury-photosensitized production of free radicals in organic glasses
Trapped free radicals are produced by Hg-photosensitized reactions when 3-methylpentane (3MP), CH/sub 3/OH, C/sub 2/H/sub 5/OH or C/sub 3/H/sub 7/OH glasses containing dissolved or vapor deposited Hg are exposed to 254- or 185-nm light at 77/sup 0/K. During illumination at 254 nm the uv absorption peak of the Hg in the region of 250 to 260 nm decreases while the radical concentration grows to a plateau. Subsequent steady illumination with broad band uv light regenerates part of the original Hg absorbance and is accompanied by continuing growth in radical concentration with a yield of many radicals per dissolved Hg atom. A search for ESR and optical absorption lines of HgH in samples from which the Hg absorbance has been bleached has yielded negative results. The optical absorption spectrum of the radicals produced in 3MP is reported. (auth)
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 7199680
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 79:20; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
ABSORPTION SPECTRA
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
ELEMENTS
GLASS
KINETICS
MAGNETIC RESONANCE
MERCURY
METALS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
RADICALS
REACTION KINETICS
RESONANCE
SPECTRA
ULTRAVIOLET RADIATION