Article (Scientific journals)
High Resolution Electron Energy Loss Spectroscopy Investigation of the Vibrational Structure and Order of an Octadecanethiol Monolayer on Gold Substrates
Duwez, Anne-Sophie; Yu, Li-Ming; Riga, Joseph et al.
2000In Journal of Physical Chemistry B, 104, p. 8830-8835
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Keywords :
monolayers; self-assembly; HREELS; electron spectroscopy
Abstract :
[en] The vibrational spectra induced by electron beam from octadecanethiol monolayers adsorbed on gold are reported as a contribution to study in detail the structure of the layers, through an analysis of the interaction mechanisms between the electrons and these organic ultrathin films. To show the different spatial distribution of scattered electrons from dipole and impact interactions with the monolayer, angular distributions of elastic and inelastic scattered electrons were measured for various primary energies. The absolute electron scattering loss probabilities from both dipole and impact interactions were estimated for different vibrational modes. The study of these different mechanisms was first hampered by the poor order of the layers adsorbed on evaporated gold. It became therefore highly desirable to perform the experiments on a single-crystal substrate. Using Au(111) and Au(100) single crystals as substrates, it was possible to separate the spectral response from impact and dipole interacting electrons. A negative ion resonant behavior has been observed in the energy dependence of the electron scattering differential cross sections
Disciplines :
Chemistry
Author, co-author :
Duwez, Anne-Sophie  ;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP. Present address: University of Liège
Yu, Li-Ming;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Riga, Joseph;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Delhalle, Joseph;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Pireaux, Jean-Jacques;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Language :
English
Title :
High Resolution Electron Energy Loss Spectroscopy Investigation of the Vibrational Structure and Order of an Octadecanethiol Monolayer on Gold Substrates
Publication date :
2000
Journal title :
Journal of Physical Chemistry B
ISSN :
1520-6106
eISSN :
1520-5207
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
104
Pages :
8830-8835
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 May 2010

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