Effect of translational energy on the reaction Li + HF(v = 0) → LiF + H

Literature Information

Publication Date 2004-03-18
DOI 10.1039/B400926F
Impact Factor 3.676
Authors

O. Höbel, R. Bobbenkamp, A. Paladini, A. Russo, H. J. Loesch


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Abstract

In a crossed molecular beam study we have measured double differential cross sections for the reaction Li + HF(v = 0) → LiF + H at collision energies ranging from Etr = 88 to 378 meV. With rising Etr the angular distribution of LiF in the center-of-mass frame changes from nearly forward–backward symmetric to preferred forward scattering. The mean relative recoil energy of the products amounts to approximately 50% of the available energy with a slight tendency to decrease with rising Etr. Our findings agree well with results of quasiclassical trajectory calculations based on the potential energy surface of Laganà and co-workers. The calculations suggest that the change of the scattering characteristics is caused by the significant dependence of the differential cross sections on the rotational enery of HF rather than by the transition from a long lived complex to a direct mechanism. The present findings are consistent with the results of an earlier crossed beam study obtained employing significantly different experimental techniques and data analysis procedures (C. H. Becker, P. Casavecchia, P. W. Tiedemann, J. J. Valentini and Y. T. Lee, J. Chem. Phys., 1980, 73, 2833).

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