Electromagnetic Wave Energy and Momentum Equations in Transparent, Dispersive, Space- and Time- Varying Media

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The proton spin-lattice relaxation time ( T.) of the p and 7 phases of tetramethylsilanewas measured between 20.5 and 161.2 K with particular attention to the dependence ofT. on the Larmor frequency and on the kind of pulse sequence. The behavior of non-exponential magnetization recovery was explained in terms of the symmetry restrictedspin diffusion theory. The tunneling rotational effects appeared in the spin-latticerelaxation and were observed by the field cycling technique which led to the twotunneling frequencies, 15.8 80.9 MHz and 24.0 -l- 1.4 MHz, in the 7 phase in the lowtemperature limit. Both frequencies decrease with temperature. The 73 phase showedmore complicated tunneling spectra. The behavior, compared with that of hexamethyl-benzene, suggests that there is coupling between methyl groups in a Si(CH.). moleculealthough weaker than in hexamethylbenzene.
社団法人日本物理学会の論文
1981-02-15