RUTHERFORD BACKSCATTERING ANALYSIS USING LITHIUM IONS

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Presentation transcript:

RUTHERFORD BACKSCATTERING ANALYSIS USING LITHIUM IONS Trevor Derry, Morgan Madhuku and Tony Miller. WITS, iThemba LABS (G) & the DST-NRF CoE-SM

Lithium-7 RBS questions Does it work / can we do it? Are the Li+ beam currents large enough? Are the spectra linear in backscattered energy? How good is the resolution? Can we accumulate enough counts in a reasonable time for practical experiments?

Previous work: J. A. Leavitt et al, Nucl. Instrum. & Meth Previous work: J.A. Leavitt et al, Nucl. Instrum. & Meth. B35 (1988) 333-338

Previous work: J. A. Leavitt et al, Nucl. Instrum. & Meth Previous work: J.A. Leavitt et al, Nucl. Instrum. & Meth. B35 (1988) 333-338

RBS spectrum of 3,6 MeV 7Li+ ions scattered from thin Au, Ni, Al and O films on carbon

RBS spectrum of 3,0 MeV protons scattered from thin Au, Ni, Al and O films on carbon

RBS formulae Kinematic factor 𝐾= 𝐸 1 𝐸 0 𝛥 𝐸 1 𝛥𝑥 =𝐾 𝑑𝐸 𝑑𝑥 𝑖𝑛 − 1 cos 𝜃 𝐿 𝑑𝐸 𝑑𝑥 𝑜𝑢𝑡 𝑁 𝐴 = 𝑃 𝑖 𝛥𝑆 𝛥 𝐸 1 𝑑𝑥 𝑑 𝐸 1 𝑍 𝑠𝑢𝑏 𝑍 𝑖 2 𝜌 𝑠𝑢𝑏 𝑁 ∗ 𝑀 𝑠𝑢𝑏 cos𝜃

Ni in Si – 1,9x1016 ions/cm2 (Li+~80pA, 40 mins)

P in glassy C – 6x1016 ions/cm2 (Li+~80pA, 40 mins)

Zinc sheet (same conditions)

Silver sheet (same conditions)

Implanter calibration curves