Study of the Rotational Spectrum of the Ne–N2O van der Waals Dimer with a Fourier Transform Microwave Spectrometer

✍ Scribed by Mwanı̃ki S. Ngarı̃; Wolfgang Jäger

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 357 KB
• Volume: 192
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1998.7697

✦ Synopsis

Rotational spectra of six isotopomers of the van der Waals dimer Ne-N 2 O, namely 20 Ne-14 N 14 NO, 22 Ne-14 N 14 NO, 20 Ne-14 N 15 NO, 22 Ne-14 N 15 NO, 20 Ne-15 N 14 NO, and 22 Ne-15 N 14 NO, were measured in the frequency range between 5 and 18 GHz using a pulsed beam cavity Fourier transform microwave spectrometer. The spectra are those of prolate asymmetric rotors and are in accord with a T-shaped structure of the complex. Both a-and b-type transitions were measured. Nuclear quadrupole hyperfine patterns of the rotational transitions due to the 14 N nuclei were observed and analyzed. The rotational and centrifugal distortion constants were determined, as well as the quadrupole coupling constants aa and bb , for both terminal and central 14 N nuclei. The distance from the center of mass of the N 2 O subunit to the Ne atom and the angle between this distance and the N 2 O axis were derived from the rotational constants. The structural parameters indicate that the Ne atom is on average closer to the O atom than to the terminal N atom.