Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
95 (1991), S. 3841-3842
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
In a crossed beam experiment we have investigated the influence of the collision geometry on the (in plane) flux of products for the reaction Li+HF(v=1, j=1, m=0)→LiF+H. The spatial alignment of the molecular axes was achieved by applying the infrared radiation pumping technique in a strong electric field. Two geometries have been selected; they feature alignments where the axes stand either preferentially perpendicular to the relative velocity of the approaching reagents (V) and the scattering plane, or lie parallel to V. We find at a scattering angle in the center-of-mass frame of roughly 115° that for the parallel geometry (end-on attacks) a factor of 2.2 more LiF molecules are detected than for the perpendicular one (side-on attacks). This huge steric effect is well recovered by a trajectory calculation based on the ab initio potential energy surface (PES) of Chen and Schaefer. The main reason for the magnitude of the effect is that the products separate along the molecular axis and thus vanish to a large extent from the scattering plane when the molecules stand perpendicular to it.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.460785
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