Chemisorption of carbon monoxide on polycrystalline tungsten

1969 ◽  
Vol 65 ◽  
pp. 876 ◽  
Author(s):  
M. P. Hill ◽  
B. A. Pethica
Keyword(s):  
Carbon Monoxide ◽  
Polycrystalline Tungsten

THE INTERACTIONS OF NITROGEN AND CARBON MONOXIDE ON POLYCRYSTALLINE TUNGSTEN

1964 ◽  
Vol 42 (6) ◽  
pp. 1256-1269 ◽  
Author(s):  
L. J. Rigby
Keyword(s):  
Carbon Monoxide ◽  
Mass Spectrometer ◽  
Tungsten Wire ◽  
Activation Energies ◽  
Β Phase ◽  
Polycrystalline Tungsten

Desorption spectra from a polycrystalline tungsten wire have been obtained with a mass spectrometer to study: (a) the effect of preadsorbed nitrogen on the adsorption of carbon monoxide; (b) the reversibility and rearrangement of the carbon monoxide monolayer; and (c) the slow replacement of carbon monoxide by nitrogen. Surface coverages have been measured, and the activation energies of desorption obtained for all phases of carbon monoxide and the β phase of nitrogen.

THE ADSORPTION AND REPLACEMENT OF HYDROGEN ON POLYCRYSTALLINE TUNGSTEN

1965 ◽  
Vol 43 (6) ◽  
pp. 1020-1035 ◽  
Author(s):  
L. J. Rlgby
Keyword(s):  
Carbon Monoxide ◽  
Second Order ◽  
Tungsten Filament ◽  
Α Phase ◽  
Polycrystalline Tungsten

Desorption spectra have been obtained which show that there are at least three β phases of hydrogen desorbed from a tungsten filament. The β2 phase was desorbed with second-order kinetics. The replacement of hydrogen by nitrogen and by carbon monoxide was observed, and simple replacement mechanisms are proposed for these processes and the replacement of carbon monoxide by nitrogen. When carbon was preadsorbed on the surface, the β1 phase of hydrogen and all the β phases of carbon monoxide and nitrogen were reduced, but the α phase of carbon monoxide was increased. A concept of identical and nonidentical sites is introduced to explain these results.

Thermal desorption: Chemisorption of carbon monoxide on polycrystalline tungsten

1982 ◽  
Vol 47 (3) ◽  
pp. 884-890 ◽  
Author(s):  
Jan Hrbek ◽  
Jan Pavlíček
Keyword(s):  
Carbon Monoxide ◽  
Adsorption Isotherm ◽  
Thermal Desorption ◽  
Dissociative Adsorption ◽  
Experimental Results ◽  
Polycrystalline Tungsten

The adsorption isotherm was constructed from thermal desorption spectra of carbon monoxide on tungsten. Comparison of the experimental results with model isotherms supports a concept of the dissociative adsorption of carbon monoxide on tungsten.

Annealing Of Radiation Damage in Tungsten

1970 ◽  
Vol 28 ◽  
pp. 412-413
Author(s):  
Robert C. Rau ◽  
John Moteff
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Radiation Damage ◽  
Thermal Annealing ◽  
Neutron Fluence ◽  
Dislocation Loops ◽  
Defect Clusters ◽  
Polycrystalline Tungsten ◽  
Transmission Electron ◽  
Radiation Induced

Transmission electron microscopy has been used to study the thermal annealing of radiation induced defect clusters in polycrystalline tungsten. Specimens were taken from cylindrical tensile bars which had been irradiated to a fast (E > 1 MeV) neutron fluence of 4.2 × 1019 n/cm2 at 70°C, annealed for one hour at various temperatures in argon, and tensile tested at 240°C in helium. Foils from both the unstressed button heads and the reduced areas near the fracture were examined.Figure 1 shows typical microstructures in button head foils. In the unannealed condition, Fig. 1(a), a dispersion of fine dot clusters was present. Annealing at 435°C, Fig. 1(b), produced an apparent slight decrease in cluster concentration, but annealing at 740°C, Fig. 1(C), resulted in a noticeable densification of the clusters. Finally, annealing at 900°C and 1040°C, Figs. 1(d) and (e), caused a definite decrease in cluster concentration and led to the formation of resolvable dislocation loops.

Carbon monoxide poisoning

2000 ◽  
Vol 12 (4) ◽  
pp. 354-357
Author(s):  
David R Smart ◽  
Paul D Mark
Keyword(s):  
Carbon Monoxide ◽  
Carbon Monoxide Poisoning
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