dc.creator Tang, Jian en_US dc.creator McKellar, A. R. W. en_US dc.date.accessioned 2006-06-15T20:32:39Z dc.date.available 2006-06-15T20:32:39Z dc.date.issued 2003 en_US dc.identifier 2003-FB-03 en_US dc.identifier.uri http://hdl.handle.net/1811/20744 dc.description References [1] J. Tang, Y. Xu, A.R.W. McKellar, and W. J\""{a}ger, Science, 297, 2030 (2002). [2] C.E. Chuaqui, R.J. Le Roy, and A.R.W. McKellar, J. Chem. Phys. 101, 39 (1994); M.-C. Chan and A.R.W. McKellar, J. Chem. Phys. 105, 7910 (1996); A.R.W. McKellar, Y. Xu, W. J\""{a}ger, and C. Bissonette, J. Chem. Phys. 110, 10766 (1999). [3] F. Paesani and F.A. Gianturco, J. Chem. Phys. 116, 10170 (2002). en_US dc.description Author Institution: Steacie Institute for Molecular Sciences, National Research Council of Canada en_US dc.description.abstract Infrared spectra of $He_{N}-CO$ clusters with N up to about 20 have been observed in the $2145 cm^{-1}$region of the C-O stretch using a tunable diode laser spectrometer and a high pressure ($\leq 40$ atm) pulsed supersonic jet expansion from a cooled ($\geq -150$ C) pinhole or slit nozzle. Compared to our recent work [1] on $He_{N}-COS$ clusters, the $He_{N}-CO$ spectra are much cleaner."" They can therefore be followed to higher N-values, but contain less rotational information. Two series of R(0) transitions were observed, each correlating smoothly with the known [2] a-type and b-type lines of the binary complex, He-CO. The b-type series starts off about 7 times stronger for $N=1$, but then loses intensity to the a-type series with increasing N. The cluster size numbering was reliably established up to $N=14$ for the a series and $N=6$ for the b series. Some warmer"" lines (e.g. R(1)) were observed and tentatively assigned, but these were not sufficient to enable rotational analysis. Thus it is not yet possible to separate the effects of vibrational shifts and rotational dynamics on the line positions. Two critical regions of cluster size were observed: around $N=7$ (where the b-type series disappears) and $N=15$ (where the a-type series fragments). These regions may be related to the calculated [3] maximum and minimum, respectively, in the incremental binding energy per added helium atom. en_US dc.format.extent 303720 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title HIGH RESOLUTION INFRARED SPECTRA OF $He_{N}-CO$ CLUSTERS IN THE RANGE $N = 1$ TO $20$ en_US dc.type article en_US
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