Adsorption of nitrogen on perfect Re(0001) planes
Journal Article
·
· J. Vac. Sci. Technol., v. 13, no. 1, pp. 310-313
In probing the effect of surface structure upon chemical interactions at the gas--metal interface, it is essential to document the role of imperfections. This has been done for the chemisorption of molecular N$sub 2$ on the basal plane of Re, using a combination of field-emission and field-ion microscopy. At surface temperatures T/subs/<150 K, a weakly chemisorbed state of nitrogen forms on the perfect (0001) plane. On warming, this desorbs without conversion to atomically bound material. At 300 K, the (0001) plane remains bare, even after exposure to >3x10$sup 19$ molecules/cm$sup 2$, while the rougher planes are saturated with nitrogen. Direct dissociation of N$sub 2$ does not occur on the basal plane of Re. The (0001) plane does fill with atomically bound nitrogen ar T/subs/> or =550 K. This step appears to involve diffusion of the dissociated gas from adjacent, atomically rough surfaces on which molecular dissociation is relatively rapid. (AIP)
- Research Organization:
- Coordinated Science Laboratory and Department of Metallurgy, Univerversity of Illinois at Urbana-Champaign, Urbana, Illinois 61801
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-030171
- OSTI ID:
- 4035984
- Journal Information:
- J. Vac. Sci. Technol., v. 13, no. 1, pp. 310-313, Journal Name: J. Vac. Sci. Technol., v. 13, no. 1, pp. 310-313; ISSN JVSTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*NITROGEN-- CHEMISORPTION
*RHENIUM-- SORPTIVE PROPERTIES
360104* --Materials--Metals & Alloys--Physical Properties
ADSORPTION
CRYSTAL DEFECTS
DESORPTION
DIFFUSION
DISSOCIATION
FIELD EMISSION
ION MICROSCOPY
MICROSTRUCTURE
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
N50330 --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
SURFACES
TEXTURE
*RHENIUM-- SORPTIVE PROPERTIES
360104* --Materials--Metals & Alloys--Physical Properties
ADSORPTION
CRYSTAL DEFECTS
DESORPTION
DIFFUSION
DISSOCIATION
FIELD EMISSION
ION MICROSCOPY
MICROSTRUCTURE
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
N50330 --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
SURFACES
TEXTURE