ESR measurements of (DMe-DCNQI)2Li

X-band ESR measurements have been performed on a (DMe-DCNQI) 2 Li single crystal in the temperature region from 3 K to 300 K. Electron paramagnetic resonance was observed in the whole temperature region. An abrupt decrease of the integrated intensity was observed below around 50 K which is consistent with the previous magnetic susceptibility measurement result. Magnetic one dimensionality of the system is discussed by the temperature dependence of g-values and linewidths in connection with the 2k F and 4k F transitions in (DMe-DCNQI) 2 Li.