Elsevier

Chemical Physics

Volume 65, Issue 1, 15 February 1982, Pages 83-95
Chemical Physics

Laser diagnostics of the surface catalyzed equilibrium 2NaNa2

https://doi.org/10.1016/0301-0104(82)85058-1Get rights and content

Abstract

We report on the reaction between Na atoms and Na2 molecules in the Knudsen regime. A spatial temperature gradient, applied across a glass vessel which contains sodium vapor leads to Na and Na2 density gradients; these are measured using laser diagnostics. The measured gradients are compared with calculated gradients, based on a kinetic model. It is found that (i) the reaction 2Na → Na2 occurs at the glass surface, (ii) the glass surface behaves as a true catalyst and (iii) the chemical accommodation coefficient of a Na2 molecule colliding with the glass surface is 1.0(+0, −0.2).

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    Present address: Institute of Physics, University of Aarhus, DK 8000 Aarhus C. Denmark.

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