The ground-state rotational spectrum of the heterodimer (NH3,HI) has been observed by pulsed-nozzle, Fourier-transform microwave spectroscopy. A quartz oreservoir/nozzle attached to the outlet of a solenoid valve allowed pulses of ammonium iodide vapour/argon to be produced without encountering metal surfaces. The observed spectroscopic constants are consistent with a hydrogen-bond description H3N⋯HI rather than an ion-pair H3N–⋯I– description of the observed species.
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Legon et al. (1992) studied this question.
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