An infrared diode laser has been used to irradiate one of the N–D stretching bands of the title compound. The irradiation induces reorientation of the NH3D+ ions and the N–D stretching spectrum changes accordingly. The perturbed orientational distribution of the NH3D+ ions relaxes back to equilibrium by tunneling. The various rates have been measured.
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Trapani et al. (1987) studied this question.
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