Proton Magnetic Resonance in Pure and Doped Ice

Basing upon a carefully designed method of measurement in samples showing long T 1 , a complete proton magnetic resonance experiment of ice is attempted. First, on a second moment argument in rigid lattice state, the possibility that protons do not lie on the inter-oxygen lines is pointed out, in connection with the neutron diffraction studies. Secondly, from the relaxation time and line-narrowing measurements, the difference between the behaviors of protons in pure and doped ice is discussed, the results of the dielectric and the direct current conductivity measurements by Zürich group being taken into consideration.