Solute concentration, energy absorption

The products resulting from this energy absorption in aerated water are H, OH, H02, H202, and e3q in concentrations which depend upon the dose rate and upon the pH of the solution, and the nature of the solute molecules.133 These species react with dissolved nucleic acid derivatives. There is a great difference between this sort of interaction and that in photochemistry where only the solute molecule absorbs the energy, and the ensuing reactions are those of the excited solute molecule. 

Irradiation Procedures. G(Fem) of 15.6 for the ferrous sulfate dosimeter was determined in our laboratory by Hochanadel and Ghorm-ley (II). G-values reported here are based on total energy absorbed by the solutions. The energy absorbed in concentrated sodium nitrate solutions relative to the ferrous sulfate dosimeter was taken to be in the ratio of electron densities since energy absorption in 60Co irradiations is caused essentially only by Compton recoil electrons. 

Since we have obtained evidence for nitrous acid as the intermediate which causes post-irradiation reduction of cerium (IV) for 00Co gamma experiments, nitrous acid must also be the intermediate which causes the post-irradiation reaction in the pulsed electron experiments of Pikaev, Glazunov, and Yakubovich (20). Their failure to reach this conclusion may be because of non-uniform energy absorption which caused cerium-(IV) concentration gradients in their irradiated solutions and made difficult the duplication of identical conditions for the non-radiolytic reaction between cerium (IV) and nitrous acid. Energy absorption in the Ghorm-ley-Hochanadel (9) source, which we used, is essentially uniform. 

The heat of formation of 2,8,9-trioxa-5-aza-l-boratricyclo[3,3,3,0 > ]undecane in the gas phase has been determined (191.5 0.4 kcalmol- ) as has the bond energy of the N B dative bond. A study describing the recrystallization of triarylboranes has appeared as has a report concerning the solvent isotope effect on the rate of methoxyl exchange between methyl borate and methanol. 2-[l-(o-dihydroxyborylphenyl)-2-phenylethyl]-2-imidazoline has been used for the selective determination of tartaric acid in aqueous solution and the absorption and emission properties of a series of phenyl-substituted dimesityl-boranes have been described. Synchronous spin- and stereo-isomerization of the complex cw-Fe(phen) a(NCBPh 3) 2 have been reported, The kinetics and mechanism of the protodeboronation of ferroceneboronic acid in moderately concentrated HaSO have been studied. ... 

The decrease of standing current due to the electron-capture process is proportional to the solute concentration in a process reminiscent and formally similar to Beer s law of optical absorption, except that thermal-energy electrons rather than photons are involved ... 

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