Triplet-State Electron Spin Resonance of an H-Atom-Methyl-Radical Complex in a Solid Matrix

摘要: The electron spin resonance of paramagnetic species produced by $\ensuremath{\gamma}$ irradiation solid methane at 4.2\ifmmode^\circ\else\textdegree\fi{}K has been observed. In addition to the expected signals from individual H and C${\mathrm{H}}_{3}$ radicals, weaker exchange-coupled radicals were exchange interaction is isotropic, but there an anisotropic dipole-dipole between aligned moments which gives rise a splitting 91 G. Analysis this indicates separation coupled be 6.76 \AA{}. hyperfine 255 G that each proton group 11.5 G, or one-half those for isolated C${\mathrm{H}}_{3}$. These features are shown in agreement with theoretical predictions. Similar effects observed C${\mathrm{H}}_{4}$ irradiated krypton matrix 4.2\ifmmode^\circ\else\textdegree\fi{}K.