Crossed beam studies of the C + C2H2 and C2 + C2H2 reactions: Dynamics of C3, linear and cyclic-C3H, and C4H formation

PHYS 603

P. Casavecchia, piero@dyn.unipg.it, F. Leonori, R. Petrucci, K. M. Hickson, E. Segoloni, A. Bergeat, and N. Balucani. Dipartimento di Chimica, Università degli Studi di Perugia, Via Elce di Sotto, 8, Perugia, 06123, Italy
The dynamics of the reactions of C(3P/1D) and C2(X1Σg+/a3Πu) with acetylene were studied by using the crossed molecular beam (CMB) technique with mass-spectrometric detection. These reactions are of basic chemical interest and great relevance in combustion chemistry and astrochemistry. We have exploited the capability of (i) generating continuous supersonic beams of C and C2 (with C2/C~0.03), (ii) crossing the reactant beams at variable angles, and (iii) detecting the products by "soft" electron-ionization. The C2 beam is characterized by LIF. From product angular distributions and time-of-flight spectra in a wide range of collision energies we have identified the primary products and characterized the detailed dynamics (including branching ratios) of the competing pathways leading, for C(3P/1D) + C2H2 to linear and cyclic-C3H + H and to C3 + H2, and for C2 + C2H2 to C4H + H.
 

PHYS Poster Session - Computational Spectroscopy and Reaction Dynamics
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008