Investigation of sputtering and secondary-ion emission from polycrystalline metal foils under MeV heavy-ion bombardment

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7201910

O'Connor, J P

During this investigation, three analytical techniques were used: secondary-ion mass spectrometry, secondary-ion energy spectrometry, and total-sputtering-yield measurements. The mass-spectrometric measurements consisted, in part, of a comparison of positive secondary ion emission during 100-keV /sup 40/Ar/sup +/ and 70-MeV /sup 79/Br/sup 7 +/ ion bombardment of several targets. Results of these measurements demonstrated that the MeV projectiles were substantially more efficient in producing positive secondary ions of electronegative surface constituents. To supplement these observations, the variation of ion emission from Al, V, and Y surfaces was measured as a function of /sup 79/Br projectile energy. Measurements of integrated secondary-ion energy spectra were obtained from Cu, Nb, and Ta foils during 75 MeV /sup 79/Br/sup 8 +/ ion bombardment. The energy distributions were observed to peak at about 2 eV. Total sputtering yields were obtained from Nb and Y targets during 70-MeV /sup 79/Br/sup 7 +/, 100-keV /sup 40/Ar/sup +/, and 100-keV /sup 79/Br/sup +/ bombardment. The yields for the 70-MeV projectiles were 0.14 +/- 0.03 and 0.04 for Nb and Y, respectively. Consistency of results indicates that collisional sputtering is the dominant mechanism for the sputtering of metals during high-energy projectile bombardments.

• Research Organization: Yale Univ., New Haven, CT (USA)
• OSTI ID: 7201910
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ALUMINIUM
ARGON IONS
BEAMS
BROMINE 79
BROMINE IONS
BROMINE ISOTOPES
CHARGED PARTICLES
COPPER
ELEMENTS
EMISSION
ENERGY RANGE
INTERMEDIATE MASS NUCLEI
ION BEAMS
IONS
ISOTOPES
KEV RANGE
KEV RANGE 100-1000
MASS SPECTROSCOPY
METALS
MEV RANGE
MEV RANGE 10-100
NIOBIUM
NUCLEI
ODD-EVEN NUCLEI
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIOISOTOPES
SECONDARY EMISSION
SECONDS LIVING RADIOISOTOPES
SPECTROSCOPY
SPUTTERING
STABLE ISOTOPES
TANTALUM
TRANSITION ELEMENTS
VANADIUM
YTTRIUM