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The energy and angular dependence of dissociative hydrogen adsorption on Cu(110)

✍ Scribed by B.E. Hayden; C.L.A. Lamont

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
370 KB
Volume
160
Category
Article
ISSN
0009-2614

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✦ Synopsis

The dissociative sticking probability (So) of HI on Cu( 110) for surface temperatures in the range 140< T,<250 K has been measured as a function of translational energy (I?,) and angle (#) of the incident molecules. The onset of sticking is sharp and occurs when the normal component of translational beam energy E i or 200 meV. At 260 meV, S, is still only 2x IO-" but is rising quickly. A "near" normal energy scaling for So is exhibited in the measured range 180<E, x 260 meV. Measurements of S, as a function of incident angle reveal an angular-dependent sticking probability which is strongly peaked (cos"$) towards the surface normal. These results indicate that the activation barrier to dissociative adsorption is significantly higher than previously believed.

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