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Adsorption of hydrogen and deuterium on Fe(110) as studied by thermal desorption spectroscopy and helium specular scattering

Thesis/Dissertation ·
OSTI ID:6931087
The adsorption of hydrogen on iron plays an important role in many processes of practical significance. Hydrogen adsorption on iron is of central importance in heterogeneous catalysis, ammonia synthesis and hydrogen embrittlement of ferrous alloys. In this study the adsorption of hydrogen and deuterium on Fe(110) was studied using thermal desorption spectroscopy and helium beam specular scattering. Thermal desorption spectroscopy yielded an activation energy for desorption of deuterium from Fe(110) of 27.3 kcal/mole. An investigation of the angular distribution of the desorbed deuterium molecules revealed the presence of an activation barrier for adsorption. The angular distribution of the desorbed molecules was analyzed with the aid of two models. Activation energies for adsorption of 582 cal/mole (Van Willigen model) and 708 cal/mole (Comsa and David model) are predicted. Within limits (coverage less than a half monolayer), helium specular scattering was shown to be a useful technique for the investigation of hydrogen and deuterium adsorption kinetics. Activation energies for the desorption of hydrogen and deuterium from Fe(110) were found by helium specular scattering to be 25.2 kcal/mole and 26.4 kcal/mole, respectively.
Research Organization:
Rensselaer Polytechnic Inst., Troy, NY (USA)
OSTI ID:
6931087
Country of Publication:
United States
Language:
English

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Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACTIVATION ENERGY
ADSORPTION
ATOMIC BEAMS
BEAMS
DESORPTION
DEUTERIUM
ELEMENTS
ENERGY
FLUIDS
GASES
HELIUM
HYDROGEN
HYDROGEN ISOTOPES
IRON
ISOTOPES
LIGHT NUCLEI
METALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
SCATTERING
SORPTION
SORPTIVE PROPERTIES
STABLE ISOTOPES
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS