15min:

F. MIVEHVAR, J. NOROOZ OLIAEE, M. DEHGHANY, N. MOAZZEN-AHMADI, Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada; A. R. W. MCKELLAR, Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada.

In an effort to observe the spectra of acetylene clusters (C₂H₂) _n with n\geq 4 and the very weakly bound He-C₂H₂ complex, spectra of acetylene-d₂ clusters in the region of the C₂D_{2 3} fundamental ( 2439 cm^-1) were recorded using a tunable diode laser to probe a pulsed supersonic slit jet expansion. So far, several bands below 2439 cm^-1 have been recorded. Two can be attributed to a parallel ₃^|| and perpendicular ₃^\perp band for the T-shaped C₂D₂ dimer. The interconvesion splittings are clearly seen in these bands. There are other mystery bands whose origins are being investigated both experimentally and theoretically. In this talk I will discuss possible assignments of these bands to C₂D₂ clusters.