The angular distribution of the product desorption and the orientation of terraces; the oxidation of carbon monoxide over platinum (110)(1×2) reconstructed surfaces
✍ Scribed by Tatsuo Matsushima; Yuichi Ohno
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 315 KB
- Volume
- 169
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The angular distribution of the desorption flux of carbon dioxide produced on Pt( 110) ( 1 x 2) reconstructed surfaces was studied in both crystal azimuths of [ I i0 ] and [ 00 1 ] by means of angle-resolved thermal desorption. Heating the surface covered by CO and oxygen adatoms yields four peaks of CO* formation in the range from 160 to 430 K. The desorption of CO* in each peak yielded a sharp angular distribution collimated along the surface normal in the [ 1 IO] direction. On the other hand, the desorption of CO* produced in the dilute co-adlayer showed two maxima in the angular distribution curves in the [ 00 11 direction.
Such two-directional collimation is due to the desorption from terraces declining on the reconstructed surfaces.