Other
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confera05d&link_type=abstract
"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec
Other
Infrared/Raman
Scientific paper
Infrared spectra of N_{2}O trimers are studied using a tunable diode laser to probe a pulsed supersonic slit-jet expansion. A previous observation by R.E. Miller and L. Pedersen [J. Chem. Phys. 108, 436 (1998)] in the N_{2}O νb{1}+νb{3} combination band region ( 3480 cm^{-1}) showed the trimer structure to be noncyclic, with three inequivalent N_{2}O monomer units which could be thought of as an N_{2}O dimer (slipped antiparallel configuration) plus a third monomer unit lying above the dimer plane. The present observations cover the N_{2}O fundamental band regions νb{3} ( 1280 cm^{-1}) and νb{1} ( 2230 cm^{-1}). In the νb{3} region, two trimer bands are assigned with vibrational shifts and other characteristics similar to those in the νb{1}+νb{3} region, but in the νb{1} region all three possible trimer bands are observed. Relationships among the various bands such as rotational intensity patterns, vibrational shifts, and the properties of the related N_{2}O dimer, generally support the conclusions of Miller and Pedersen. Three trimer bands are also observed for the fully ^{15}N-substituted species in the νb{1} region, and these results should aid in detection of the as-yet-unobserved pure rotational microwave spectrum of the trimer. Finally, three combination bands involving the intermolecular van der Waals modes at 2253.7, 2255.5, and 2269.4 cm^{-1} have been measured. The analyses of these bands and the identification of the nature of the intermolecular modes involved are currently underway.
Afshari Mahin
Dehghany M.
McKellar A. R. W.
Moazzen-Ahmadi Nasser
Norooz Oliaee J.
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