Distribution functions for 2H nuclear magnetic resonance band shapes for polymerized surfactant molecules forming triply periodic surfaces
We present theoretical predictions of the distribution functions for 2H NMR bandshape for polymerized surfactant monolayers in triply periodic surfaces formed in ternary mixtures. We have calculated t...
We present theoretical predictions of the distribution functions for 2H NMR bandshape for polymerized surfactant monolayers in triply periodic surfaces formed in ternary mixtures. We have calculated t...
Diffusion of noninteracting and interacting lattice gases on heterogeneous surfaces: The bivariate random barrier model
The Monte Carlo technique is used to model surface diffusion on energetically heterogeneous surfaces. Simulations are performed for the bivariate barrier model with a concentration cH of high barriers...
The Monte Carlo technique is used to model surface diffusion on energetically heterogeneous surfaces. Simulations are performed for the bivariate barrier model with a concentration cH of high barriers...
Vibrations, coverage, and lateral order of atomic nitrogen and formation of NH3 on Ru(10
0)
J. Chem. Phys. 106, 9313 (1997); doi:10.1063/1.474042
Issue Date: 8 June 1997
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The dissociative chemisorption of nitrogen on the Ru(100) surface has been studied using high-resolution electron energy loss spectroscopy (HREELS), thermal desorption spectroscopy (TDS) and low-energy electron diffraction (LEED). To prepare a surface covered by atomic nitrogen we have used ionization-gauge assisted adsorption. A saturation coverage of 
N=0.6 is achieved of which about 30% is in the subsurface region. At saturation coverage a (
) LEED pattern is observed. The 
(Ru–N) mode at 41 meV and the ![[perpendicular]](http://scitation.aip.org/stockgif3/perp-script.gif)
(Ru–N) mode at 60 meV are identified. Upon exposing the nitrogen covered surface to hydrogen at 300 K we have observed the formation of NH3 which is characterized by its symmetric bending mode 
s(NH3) at 149 meV. At 400 K, NH3 could not be detected. The reaction intermediate NH is stable up to 450 K and has been identified by its vibrational losses (Ru–NH) at 86 meV, and (N–H) at 408 meV. The TD spectra of mass 14 show three desorption states of nitrogen, N
at 740 K (from subsurface N), N
shifting from 690 to 640 K with increasing coverage, and N
at 550 K. The activation energy for desorption via the N state is 120±10 kJ/mol. The TD spectra of mass two showed three desorption states at 450, 550, and 650 K due to the decomposition of NHx. ©1997 American Institute of Physics.
N=0.6 is achieved of which about 30% is in the subsurface region. At saturation coverage a ((Ru–N) mode at 41 meV and the (Ru–N) mode at 60 meV are identified. Upon exposing the nitrogen covered surface to hydrogen at 300 K we have observed the formation of NH3 which is characterized by its symmetric bending mode s(NH3) at 149 meV. At 400 K, NH3 could not be detected. The reaction intermediate NH is stable up to 450 K and has been identified by its vibrational losses (Ru–NH) at 86 meV, and (N–H) at 408 meV. The TD spectra of mass 14 show three desorption states of nitrogen, N at 740 K (from subsurface N), N shifting from 690 to 640 K with increasing coverage, and N at 550 K. The activation energy for desorption via the N state is 120±10 kJ/mol. The TD spectra of mass two showed three desorption states at 450, 550, and 650 K due to the decomposition of NHx. ©1997 American Institute of Physics.
| History: | Received 2 January 1997; accepted 20 February 1997 |
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Connotea
CiteULike
del.icio.us
BibSonomy
KEYWORDS and PACS
ruthenium,
nitrogen,
chemisorbed layers,
electron energy loss spectra,
thermally stimulated desorption,
low energy electron diffraction,
surface chemistry
- 68.45.-v
Surfaces and interfaces; thin films and whiskers (Structure and nonelectronic properties) Solid
fluid interfaces
- 82.65.My
Physical Chemistry Surface and interface chemistry Chemisorption - 61.85.+p
Structure of solids and liquids; crystallography Channeling phenomena (blocking, energy loss, etc.) - 34.80.-i
Atomic and molecular collision processes and interactions Electron scattering - 68.45.Da
Surfaces and interfaces; thin films and whiskers (Structure and nonelectronic properties) Solidfluid interfaces
Adsorption and desorption kinetics; evaporation and condensation
- 61.14.Hg
Structure of solids and liquids; crystallography Electron diffraction and scattering Low-energy electron diffraction (LEED) and reflection high-energy electron diffraction (RHEED) - 82.65.-i
Physical Chemistry Surface and interface chemistry - YEAR: 1996-97
PUBLICATION DATA
0021-9606 (print)
1089-7690 (online)
AIP
REFERENCES (27)
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