Rotational Spectra of He_N–N₂O (N=3-12) Quantum Clusters.

Yunjie Xu and Wolfgang Jäger
Department of Chemistry, University of Alberta, Edmonton AB  T6G 2G2, Canada

Pure rotational spectra of He_N–N₂O quantum clusters with N=3-12 were recorded with a pulsed molecular beam Fourier transform microwave spectrometer. The 'vertical', J-quantum number, assignments of the individual clusters were confirmed by microwave - microwave double resonance experiments. N number assignments were verified by careful consideration of the sample pressure and nozzle temperature dependencies of the line intensities. The obtained spectroscopic constants of the He_N–N₂O clusters are interpreted in terms of cluster structure and dynamics. We will present the observed trends of the spectroscopic constants and discuss the implications for the new concept of microscopic superfluidity.

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