Accession Number:

ADA109722

Title:

Ethylene Adsorption and Reaction on Pd(111): An Angle-Dependent EELS Analysis.

Descriptive Note:

Technical rept.,

Corporate Author:

INDIANA UNIV AT BLOOMINGTON DEPT OF PHYSICS

Personal Author(s):

Report Date:

1981-12-28

Pagination or Media Count:

20.0

Abstract:

The chemisorption and surface reactivity of ethylene on a palladium 111 surface near room temperature has been studied by high-resolution electron energy loss spectroscopy EELS. The C2H4 molecule reacts with the Pd111 surface to form a rather stable surface species which is identified as ethylidyne C3-CH3 by analysis of the EELS vibrational spectra. This molecule is also formed on Pt111 and Rh111 and is believed to be symmetrically bonded at threefold surface sites. Angle-dependent EELS spectra are reported and show the relative importance of impact and dipole excitation mechanisms Off-specular data is found to be of critical importance in drawing conclusions about surface bonding symmetry from EELS spectra.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE