Defect pairs of F and U centers ["FH(H } centers"] were observed for the first time, created by laserlight induced aggregation of F centers in NaC1, Kcl, and RbC1 crystals doped with high concentrations of substitutional H defects {U centers). The formation of these pairs was indentified by the appearance of three sharp H local-mode lines in the Raman spectrum of F centers (due to the replacement of one of the 12 Cl neighbors by a small-mass H ion). Raman studies of these local mode lines observed in diA'erent scattering geometries (A, g Eg T2g) and in first and second order, reveal their symmetry and identify them as the three orthogonal linear vibrations of the H defect in a (110)pair configuration with the F center.A simple mode1, based on the Van der %'aal interaction between the vibrating 0 dipole and the induced electronic dipole at the F center, explains well the observed local-model shifts, A speculative discussion is given on the absorption, emission, and photochemical properties of this pair formed from the two simplest prototypes of an electronic and local-model defect
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