Abstract: Several technieal problems for the measurement of electron spin-lattice relaxation T₁ by the saturation methods are discussed.When the relaxation time T₁ is deter-mined at liquid N₂ temperature,the liquid N₂ in quartz Dewer containing samples usually boils,therefore T₁ is difficult to determine.If the cooling of samples is accomplished by cooling N₂ gas flow,then T₁ is determined.The results of determining spin-lattiee relaxation time T₁ of ZnS:Mn,Cu are attained,and the T₁becomes shorter with the formation of Mn²⁺ clusters.

Key words: Relaxation time T₁, Cooling of samples