Infrared spectra of seeded hydrogen clusters:: (para-H2)N-N2O and (ortho-H2)N-N2O, N=2-13 -: art. no. 114314

High-resolution infrared spectra of clusters containing para-H-2 and/or ortho-H-2 and a single nitrous oxide molecule are studied in the 2225-cm(-1) region of the nu(1) fundamental band of N2O. The clusters are formed in pulsed supersonic jet expansions from a cooled nozzle and probed using a tunable infrared diode laser spectrometer. The simple symmetric rotor-type spectra generally show no resolved K structure, with prominent Q-branch features for ortho-H-2 but not para-H-2 clusters. The observed vibrational shifts and rotational constants are reported. There is no obvious indication of superfluid effects for para-H-2 clusters up to N=13. Sharp transitions due to even larger clusters are observed, but no definite assignments are possible. Mixed (para-H-2)(N)-(ortho-H-2)(M)-N2O cluster line positions can be well predicted by linear interpolation between the corresponding transitions of the pure clusters. (c) 2005 American Institute of Physics.