Measurement of retained hydrogen by laser thermal desorption for carbon exposed to sub-eV atomic deuterium
Retention levels for sub-eV D/sup 0/ atoms in single crystal and pyrolytic graphite were measured using a newly-developed Laser Thermal Desorption (LTD) technique. Retention levels for single crystals were approx. 3 x 10/sup 13/ D/sup 0//cm/sup 2/ for incident fluences of approx. 10/sup 19/D/sup 0//cm/sup 2/. This is about two orders of magnitude lower than D/sup 0/ retention in pyrolytic graphite, and correlates very well with the differences in effective surface areas. The D(/sup 3/He,p)/sup 4/H/sub e/ Nuclear Reaction Analysis (NRA) was used to confirm retention levels as measured by the LTD technique. A further finding was the influence of a small layer of evaporated tungsten on the sample surface. Such W impurity resulted in an increase of D/sup 0/ retention of up to a factor of ten.
- Research Organization:
- Toronto Univ., Ontario (Canada). Inst. for Aerospace Studies; Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6809356
- Report Number(s):
- SAND-83-2629C; CONF-840520-7; ON: DE84012277
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reduced deuterium retention in simultaneously damaged and annealed tungsten
Deuterium desorption from tungsten using laser heating
Related Subjects
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
CARBON
DESORPTION
DEUTERIUM
ELECTROMAGNETIC RADIATION
ELEMENTAL MINERALS
ELEMENTS
EVEN-ODD NUCLEI
GRAPHITE
HELIUM 3
HELIUM ISOTOPES
HYDROGEN
HYDROGEN ISOTOPES
IMPURITIES
ISOTOPES
LASER RADIATION
LAYERS
LIGHT NUCLEI
MINERALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RADIATIONS
STABLE ISOTOPES