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Konstanz 1998 – wissenschaftliches Programm

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MO: Molekülphysik

MO 12: Theorie: Dynamik

MO 12.7: Vortrag

Donnerstag, 19. März 1998, 12:30–12:45, M627

Rotational Alignments of Products BaBr from Ba+CH3Br and Ba+HBr — •Victor Wei-Keh WU1, Ke-Li HAN2, and Guo-Zhong HE21Victor Basic Research Laboratory,Bielefeld,FRG(http://www.uni-bielefeld.de/ fkure) — 2SKLMRD, Dalian Institute of Chemical Physics, CAS. Dalian, 116023 P.R.China

The results from detailed QCT calculations for both reactions comparing available experimental data within rather broad range of Erel show that the phenomenon of alignment in Ba+HBr is not only much more significant than Ba+CH3Br, but also the approximation of l(Ba+HBr) ≈ j’(BaBr) is well acceptable. Comparing with the CPOAM (Constrained Product Orbital Angular Momentum) model, which is approximated for the type of H1+H2L→H1H2+L, <P2(j’·k)> = -0.5 + Zm2(-lnZm+1/3), where Zm = <l’>/lmax, our values of alignment P2(j’·k) = (3cos2θ-1)/2 shows: Ba+HBr is well suitable to be described with such approx. than Ba+CH3Br. The values of P2 for Ba+HBr approach nearly the asymptotic value -0.5. Whether the reaction mechanism runs more via Stripping or Migration at certain Erel can be concluded according to how far is the deviation between the values from CPOAM and ours, is uncertain. This approx. is only suitable for reaction, where L is much lighter than both H1 and H2, and there is no or only little of internal degrees of motions in L. *Wu thanks the financial support by VBR (75%), DFG., and SKLMRD. Ref. 1. Bull. Chem. Soc. Jpn. (Submitted), 2. Chem. Comm. (To be submitted)

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