Study of hydrogen release from carbon films by helium and deuterium glow discharges
- Sandia National Laboratories, Livermore, CA 94550-0969 (USA)
Protium-rich carbon films were deposited by an RF-assisted DC glow- discharge in methane gas. The desorption characteristics of the trapped protium by ion bombardment in a subsequent glow-discharge were studied using partial pressure analysis of the desorbed species. Desorption by both helium and deuterium glow-discharges was investigated. In a helium glow, protium was released primarily as H{sub 2} and in a deuterium glow, as H{sub 2} and HD. The desorption rate over time cannot be described by a single e-folding rate. A desorption cross-section was estimated by fitting an exponential to the data measured near the beginning of the desorption run sequence. At a bias voltage of 350 V, both D and He ions show a near identical desorption cross-section of {similar to}7.5{times}10{sup {minus}17} cm{sup 2}. Deuterium glows were found to desorb {similar to}4 times more protium than those from helium glows at comparable operating conditions.
- OSTI ID:
- 7052538
- Report Number(s):
- CONF-8904230--
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Vol. 199:1; ISSN APCPC; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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CARBON
CLEANING
DEPOSITION
DESORPTION
DEUTERIUM
ELECTRIC DISCHARGES
ELEMENTS
FLUIDS
GASES
GLOW DISCHARGES
HELIUM
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
STABLE ISOTOPES
SURFACE CLEANING
SURFACE COATING
SURFACE FINISHING
THERMONUCLEAR REACTORS
VACUUM SYSTEMS