Proton Relaxation in Ice Crystals and in Frozen Paramagnetic Ionic Solutions.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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In the first part of the paper a pulse apparatus for the measurement of nuclear magnetic relaxation times is described. With this apparatus the proton relaxation in single ice crystals was investigated. From the nuclear signal after a 90 deg - pulse the proton-proton separation could be determined as 1.59 plus or minus 0.07 A. The proton resonance line in a single ice crystal is a doublet which is maintained for pure ice up to close to the vicinity of the melting point. For HF doped ice the inner mobility is increased such that the doublet separation vanishes in the vicinity of the melting point. The spin-grating relaxation time of pure and HF doped ice crystals was measured in dependence of the temperature. The nuclear magnetic relaxation times of the protons in frozen solutions of paramagnetic ions were measured as a function of the temperature and the ion concentration. Author
- Physical Chemistry