Anomalous Transverse Spin Relaxation Time of the F_A(Li) Centers in KCl and KBr

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Microwave saturation of the ESR signal for the F_A(Li) centers in KCl and KBr has been studied in slow passage condition. The values of T₁ and T₂ have been estimated from the curve-fitting with theoretical forms. The values of T₂ at liquid He temperatures are anomalously decreased in comparison with T₂ at 77 K. A tentative relaxation mechanism, which is related to tunneling motion of the Li⁺ ion, is proposed.