Anisotropic saturation of the EPR spectrum of an DCO radical stabilized in solid CO at 4.2 K and its orientation motion

Formyl radicals, DCO, were produced in solid CO matrix and studied by EPR using gas deposition technique on a cold substrate at 4.2 K. The radical electron spin-lattice relaxation was measured to be anisotropic. anisotropy found originate from the anisotropic orientational motion of with most intensive librations performed around z axis corresponding smallest moment inertia molecule. It shown that, CO, libration small molecules is modeled considering particle rotating potential box. A suggestion substantiated about complicated nature HCO including slow tunneling rotation molecule axis. Keywords: paramagnetic resonance, isolation, formyl radical, time, molecules.