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The equations of motion of the sublattice moments are discussed in the case of anisotropic g factors when the lengths of mechanical moments are conserved, or are not conserved. Experimental data on magnetic resonance in hexagonal ferrimagnet RbNiF3 and orthorhombic canted antiferromagnet NaNiFa are interpreted on the basis of such equations with the suggestion that the lengths of mechanical moments are conserved. It is shown that for both crystals the g-factor anisotropy must be taken into account.

The reaction of argon ions with hydrogen and deuterium molecules by crossed beams: Low energy resonances and role of vibronic levels of the intermediate complex Some new experimental results concerning the magnetic resonance in PrH-doped YIG are presented and discussed, together with the results for Tb H and HOH in YIG already published, in terms of existing theories. It is shown that the magnetization directions corresponding to the near crossings of energy levels in the case of Hos+ can lie within a certain local plane and, in the case of Pr H , can coincide with a local axis of the dodecahedral site (for Tb H , as Huber has found, these directions form a conical surface). The angle and temperature dependences of AH for Tb H and HOH are very similar and can be explained completely in terms of slow relaxation. For Pr s + these dependences in the directions of near crossings resemble the "anomalous'.' behavior for Yb H in octahedral sites. A contribution from transverse relaxation is probable in the case of PrH.

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