Sunz.~~zury The yield of hydrogen on radiolysis of pure cthylaniine a t rooni teniperature is 5.5 -& 0.1 and has three precursors: electrons (G = 2.1 & O s l ) , hydrogen atoms (G N 0.7), and unscavengeable hydrogex (G < 2.7) ; the maximum yield of scavengeable electrons is 2.7. SAMPLES of anhydrous ethylainine (from B.D.1-I.) (degassecl and distilled over NaOH pellets into the irradiation

Solvent extraction of scandium from perchloric or hydrochloric acid aqueous systems into benzene solutions of tetraphenyl imidodiphosphate, (PhO)2P(O)NHP(O)(PhO)2 (HA), and its sulfur analogues containing the P(O)NHP(S) or P(S)NHP(S) groups was studied. Behaving as weak acids in the aqueous phase, the reagents form complex extractable compounds ScA3 with scandium. The extraction constants were measured and found lower for the sulfur analogues than for the oxygen reagent. The configuration changes induced in the reagent by gamma irradiation from a 60Co source were studied by examining the extraction of scandium with it and by 31P NMR measurements. Whereas the changes in the solid reagent are not very marked and appear only at doses in excess of 800 kGy, the reagent dissolved in benzene exhibits configuration changes even on the application of doses at the 10 kGy level. This fact is related to the presence of benzene and dissolved oxygen in the system.

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The absorption spectrum of electrons trapped in a glassy methanol matrix was investigated and its parameters were determined. The changes of these parameters on optical bleaching and their kinetics were studied ; it followed that thc broad spectrum is an envelope of partial spectra corresponding to different kinds of trapped electrons and to their various quantum transitions. The parameters of the spectra are influenced by the presence of some solutes.On optical bleaching, the electrons are excited to higher levels from which they collapse to a molecule giving the CH30ion and simultaneously a hydrogen atom. In accordance with this mechanism, the change in the yields of trapped electrons and total hydrogen caused by the presence of electron scavengers correspond to each other. The efficiencies of electron scavcngers at 77 K parallel roughly those in liquids at room temperature.The absorption of the irradiated glassy methanol in the u.-v. is evidently due to CH20H radicals as deduced from the kinetics of their disappearance and their reaction with tetranitromethane.

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