# THE MICROWAVE ROTATIONAL SPECTRUM OF THE Ne-HCCCN VAN DER WAALS COMPLEX

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 Title: THE MICROWAVE ROTATIONAL SPECTRUM OF THE Ne-HCCCN VAN DER WAALS COMPLEX Creators: Huckauf, Aiko; Jäger, Wolfgang; Xu, Yunjie Issue Date: 2002 Abstract: We report the results of the first rotational spectroscopic investigation of the Ne-HCCCN van der Waals complex. The measurements were carried out in the frequency range from 4 to 26 GHz using a molecular beam Fourier transform microwave spectrometer. HCCCN was prepared from ethyl propiolate in the usual $way,^{a}$ and for our investigation we used a dilution of 0.2% ethynyl cyanide in neon at a total pressure of 3 to 4 atm. Strong b-type and weaker a-type transitions we observed. The spectra are consistent with a (vibrationally averaged) T-shaped geometry of the complex. The $^{14}N$ nuclear quadrupole hyperfine components of the rotational transitions were resolved. The spectral analyses yielded rotational, centrifugal distortion, and $^{14}N$ nuclear quadrupole coupling constants which were used to derive structural parameters and information about the large amplitude intermolecular motion. URI: http://hdl.handle.net/1811/20434 Other Identifiers: 2002-RA-05