Rotational Spectra of the Ne–NH₃ and Kr–NH₃ van der Waals Complexes.

Jennifer van Wijngaarden and Wolfgang Jäger
Department of Chemistry, University of Alberta, Edmonton AB  T6G 2G2, Canada

Rotational spectra of the Ne–NH₃ and Kr–NH₃ van der Waals complexes were measured between 4 and 24 GHz using a pulsed jet cavity Fourier transform microwave spectrometer. The isotopomers studied include those of ¹⁴NH₃ and ¹⁵NH₃ with ²²Ne and ²⁰Ne and with the 5 most abundant isotopes of Kr. Transitions corresponding to the RG+NH₃ Σ (j = 0, |k| = 0) internal rotor state have been measured and assigned for the Ne and Kr isotopomers and transitions related to the Σ (j = 1, |k| = 1) state have been tentatively assigned for the Kr isotopomers.
The spectra of the complexes containing ⁸³Kr and ¹⁴N showed nuclear hyperfine structure due to the quadrupole moments of the nuclei. Rotational, centrifugal distortion and quadrupole coupling constants were determined and used to calculate structural parameters.

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