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The electron spin-lattice relaxation of TEMPO and TEMPONE was measured attemperatures between 5 and 80 K in crystalline and glassy ethanol using X-bandelectron paramagnetic resonance spectroscopy. The experimental data at thelowest temperatures studied were explained in terms of electron-nuclear dipolarinteraction between the paramagnetic center and the localized excitations,whereas at higher temperatures low-frequency vibrational modes from the hostmatrix and Raman processes should be considered. The strong impact of hydrogenbonding between the dopant molecule and ethanol host on the spin relaxation wasobserved in ethanol glass whereas in crystalline ethanol both paramagneticguest molecules behaved similarly.

Electron spin-lattice relaxation in solid ethanol: the effect of nitroxyl radical hydrogen bonding and matrix disorder