Electron spin resonance of TMMC with submillimetre waves

Abstract
Electron spin resonance of TMMC is observed at the frequencies 428.6, 584.4, 693.0, 716.7, 739.2, 761.6 and 890.8 GHz at temperatures between 3 and about 200K. The g-value of 1.989+or-0.003 is more precisely determined than by a microwave experiment, g-shifts and linewidths are measured in the whole temperature range as the resonance absorptions are observed for both B0 perpendicular to c and B0//c continuously down to He temperature without disappearing as it occurs in microwave experiments. Linewidth anomalies are observed at 7+or-1 and 6+or-1K for 584.4 and 693.0 GHz, respectively.