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Evidence for the distortion of C2H4 and C2H2 chemisorbed on W(100)

✍ Scribed by T.V. Vorburger; B.J. Waclawski; E.W. Plummer

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
669 KB
Volume
46
Category
Article
ISSN
0009-2614

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✦ Synopsis

The adsorption of Cal14 on W(100) has been studied by uitravrolet photoelectron spectroscopy with hv = 21.22 ev. Thc spectrum measured sfter an mitial saturation esposure at 80 K exhΓ­bits structure which correlates weIl with energy leveIs recently c&xrlated by Demuth and Eastman (DE) for sp3 rehybridized CzH4. Dehydrogenation of the adsorbate, eitber by subsequent heating to 295 K or direct adsorption at 295 K, yields a spectrum which correlates with DE's caicutation for sp2 rehybridized CeHs. These resUbs suggest tbat CzH4 and CzHz may be distorted from their planar and Iincar structures respe:tiveIy and that the C-C bonds on these molecules are stretched by adsorption on ~V(lOO).

Quahtative arguments suggest that the bonding site for both molecules is direc_tly over a W atom and that the Dewar-Chatt model for x-d bonding IR organometailic compounds is appΓ­icable.

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