THE PHOTOLYSIS OF TRAPPED FREE RADICALS PRODUCED BY IONIZING RADIATION<sup>1</sup>

Johnsen, Russell H.

doi:10.1021/j100829a007

Cited by 32 publications

(12 citation statements)

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“…The yields of products of the 7-radiolysis of liquid ethanol that are reported in the literature show poor agreement (1)(2)(3)(4)(5). Values of G(H2) range from 3.7 to 5.5 and the yields of acetaldehyde and 2,3-butanediol show a similarly wide variation.…”

Section: Introductionmentioning

confidence: 91%

“…Values of G(H2) range from 3.7 to 5.5 and the yields of acetaldehyde and 2,3-butanediol show a similarly wide variation. The ratios of the reported yields of the products also vary greatly; for example, the value of the ratio G(acetaldehyde)/G(2,3-butanediol) has been reported to be 1.8 (3) and 0.7 (5). The discrepancies between the several sets of results are probably due partly to different experimental conditions (dose, dose rate, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Proposed mechanisms have included free radical, molecular, and ionic reactions (1)(2)(3)(4)(5)(6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

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The Radiolysis of Ethanol: Iii. Liquid Phase

Myron¹,

Freeman²

1965

Can. J. Chem.

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The G values of the major products of the r-radiolysis of liquid ethanol a t a dose of 2 X 1020 eV/g are: hydrogen, 4.2; acetaldehyde, 1.9; 2,s-butanediol, 2.2; G(-CzHsOH) = 7.5. At progressively lower doses G(Hz),increases to a ~naximum of 5.0. The yield of water, G(Hz0) = 0.5, is equal to the sum of the y~elds of the Ce fragments found in the other products.The approximate yields of three kinetically distinguishable sources of hydrogen were found to be G(e& free ion) = 0.9, G(H) = 2.7 and G(unscavengeab1e Hz) = 1.5. The half,life of solvated electrons with respect to reactions such as e,,, + CeH50-+ H is 3 ps.Both l,3-pentadiene and benzene inhibit hydrogen and glycol formation but neither affect the high dose yield of acetaldehyde. Pentadiene reacts with H atoms and other radicals and possibly also with eklV. Benzene appears to inhibit hydrogen and glycol formation mainly by an unidentified activation transfer process.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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The Radiolysis of Ethanol: Iii. Liquid Phase

Myron¹,

Freeman²

1965

Can. J. Chem.

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“…The radical presence of a hydrogen-deficient radical CHzOH in methanol yields the formyl in this system. The different behavior of radical HCO, carbon monoxide, and hydro-2-MPR-1 may arise from the fact that it gen (11,12). The radical CHBCHOH in forins a polycrystalline solid a t 77 OK. ethanol yields the CH3 radical, carbon Both 2-iCIB-1 and 2-RIP-1 form a glass a t monoxide, and hydrogen (12).…”

Section: Trapped Ally1 and Alkyl Radicalsmentioning

confidence: 99%

Electron spin resonance observations on trapped electrons and free radicals formed in olefins at 77 °K by γ-irradiation

Smith¹,

Okenka²,

Pieroni³

1967

Can. J. Chem.

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Electron spin resonance (e.s.r.) methods have been used to search for the ?-ray-induced formation of trapped electrons and free radicals in 13 straight-chain and branched-chain terminal olefins a t 77 OK. When e.s.r. spectra were observed they were used to identify the species present. Changes induced by subsequent exposure to visible and ultraviolet (u.v.) light were investigated. Trapped electrons were observed in three olefins that exist as glasses a t 77 OK, hexene-1, hexene-2, and 2-methylbutene-1, but were not detected in two other glassy olefins, possibly because of rapid annealing. No trapped electrons were found in polycrystalline olefins a t 77 OK. The possibility that COz-ions have been misinterpreted as trapped electrons in these and other systems is discussed and eliminated. The formation and behavior of free radicals and trapped electrons in irradiated 2-methylbutene-1 are analogous to those previously reported for 2-methylpentene-1 under similar conditions. These observations support the hypothesis that in these two systems ions produced initially isomerize rapidly, leading to the formation of the free radicals detected by e.s.r. The results of a subsidiary experiment suggest that hydrogen abstraction from the matrix is induced by u.v. photolysis of the radicals present in 2-methylpentene-I.

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“…Johnsen (16) found that photolyzing a n irradiated solid sample of ethanol a t and methane. ~itrav:olet light decomposes the radicals trapped in the ethanol, [8] CHICHOH + hv(u.v.)…”

Section: Discussionmentioning

confidence: 99%