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Effect of molecular energy content on the dissociative chemisorption of N2 on Re(0001)

✍ Scribed by E. Por; G. Haase; O. Citri; R. Kosloff; M. Asscher

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
693 KB
Volume
186
Category
Article
ISSN
0009-2614

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✦ Synopsis

Dissociative chemisorption dynamics of N, on Re (0001) was studied by employing molecular-beam methods. The dissociation probability So increases three orders of magnitude from 4X lOA to 4~ IO-* upon increasing the normal translational energy of N, from 0.05 to I .5 eV, respectively. These results imply the presence of a barrier for dissociation of 0.6 % 0. I5 eV. The influence of vibrational excitation of the incident molecules on S, was investigated. A quantum-mechanical study was carried out to simulate the dissociation dynamics. The calculated results reproduce the experimental So dependence on translational energy over a wide range. The vibrational energy is predicted to be less effective for the enhancement of S,,, in agreement with experiment. The quality of the agreement between the theoretical simulation and the experimental data strongly supports a tunneling process through the adiabatic barrier for dissociation as a key mechanism to explain the dynamics of Nz chemisorption over Re.

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