THE IONIC ENTRAPMENT AND THERMAL DESORPTION OF INERT GASES IN TUNGSTEN FOR KINETIC ENERGIES OF 40 ev TO 5 kev

Journal Article · Sat Feb 01 04:00:00 EST 1964 · Canadian Journal of Physics (Canada)

DOI:https://doi.org/10.1139/p64-034· OSTI ID:4071201

Kornelsen, E V

A clean polycrystalline tungsten wire was bombarded with monoenergetic ions of neon, argon, krypton, and xenon in the energy range 40 ev to 5 kev. The gas trapped in the tungsten was desorbed by then heating the wire to 2400 deg K at 66 deg K/second. Ion sticking probabilities determined from the quantities of gas desorbed ranged from approximates 0.6 for all gases at 3 kev to <10/sup -5/ at ion energies (ev) approximates 4 times the ion atomic number. From the variation of the desorption rates with temperature. six activation energies of thermal desorption were found that were not dependent on the ion or its incident energy. The lowest four (33 to 63 kcal/mole) are believed to be associated with gas trapped within a few atom layers of thc metal surface, and the highest (102 kcal/mole) with normal impurity diffusion in the bulk tungsten. (auth)

• Research Organization: National Research Council, Ottawa
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-014604
• OSTI ID: 4071201
• Report Number(s): NRC-7745; 0008-4204
• Journal Information: Canadian Journal of Physics (Canada), Journal Name: Canadian Journal of Physics (Canada) Vol. Vol: 42; ISSN CJPHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ADSORPTION
ARGON
ATOMS
CRYSTALS
DESORPTION
DIFFUSION
ELECTRIC CHARGES
ENERGY RANGE
EV RANGE
EXCITATION
HEATING
IMPURITIES
INERT GASES
ION BEAMS
KEV RANGE
KRYPTON
LAYERS
METALS
NEON
PHYSICS
SURFACES
TEMPERATURE
TRAPS
TUNGSTEN
VARIATIONS
WIRES
XENON