Impurity Nuclear Spin–Lattice Relaxation Suppression and Charge Exchange of Chromium Ions in a γ-Irradiated Ruby Crystal

The possibility of directly separating and measuring the impurity and lattice contributions to nuclear spin–lattice relaxation under the condition of a steady-state magnetic saturation is demonstrated in the particular case of27Al nuclei in a γ-irradiated ruby crystal. Contributions from trivalent and charge-exchanged chromium ions to impurity nuclear relaxation were separated. The number of charge-exchanged chromium ions was found. The spin relaxation time of Cr4+centers was estimated.