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VOLUME 28 (1978) | ISSUE 11 | PAGE 692
Interference between overtone states of an impurity and the host lattice in an NH4CI
The case when an impurity that does not give rise to a local vibration in the first-order spectrum produces a sharp singularity in the two-phonon transition spectrum is investigated for the first time ever. It is observed that introduction of N15H4+ ions in an Nl4H4Cl crystal produces a narrow dip in the band of the quasibound two-phonon ω4 + ω4 transition.