Abstract
The rotational spectrum of the weakly hydrogen-bound pyrrole·ammonia complex has been observed in the frequency range from approx. 3 to 13 GHz using molecular beam Fourier transform microwave (MB-FTMW) spectroscopy. The assignment of the spectra of two isotopologues (pyrrole· 15NH 3 and pyrrole· 14NH 3) was facilitated by ab initio predictions of the structure of the complex. Tentative assignments from broadband scans were finally confirmed by application of a double resonance technique. A total of 14 and 12 a-type rotational lines for each isotopologue, respectively, were observed, exhibiting hyperfine structures due to 14N nuclear quadrupole coupling. From the spectra, rotational and centrifugal distortion constants as well as 14N nuclear quadrupole coupling constants were derived. The results are discussed in this paper in view of structural parameters and dynamical properties of the complex.
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