. 55,3356 (1977). Pulse radiolysis of tetrahydrofuran (THF), dimethoxyethane (DME), diglyme (DG), and triglyme (TG), results in the formation of solvated electrons, e,-, with optical band maxima h, , . 2 1840 nm. In the presence of alkali metal salts transient optical bands are observed with h,,. at -900 and 2 1600 nm. The latter bands are assigned to the formation of 'monomeric' species of stoichiometry M considered to be 'tight' and 'loose' ion-pairs, respectively. The proportion of 'loose' ion-pairs increases with decreasing temperature and increasing coordination of the solvent in the order THF << DME < DG < TG. These results demonstrate a good correlation with established electron spin resonance data in alkali metal solutions and substantiate the coexistence of at least two 'monomeric' species in DME and the glymes. THF << DME < DG < TG. Ces rksultats dkmontrent une bonne corrklation avec les donnkes ktablies par resonance de spin Clectronique en solutions de mktaux alkalins et justifient la coexistence d'au moins deux esptces "monorntres" dans le DME et les glymes.[Traduit par le journal]