Dr. Ranjan Ramachandra Profile

Dr. Ranjan Ramachandra

Associate Development Engineer at Univ of California San Diego

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Proceedings Article | 24 March 2008 Paper

Modeling for metrology with a helium beam

Ranjan Ramachandra, Brendan Griffin, David Joy

Proceedings Volume 6922, 69221W (2008) https://doi.org/10.1117/12.772300

KEYWORDS: Ions, Metrology, Helium, Monte Carlo methods, Gold, Solids, Ion beams, Copper, Aluminum, Silver

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IONiSE is a Monte Carlo simulation which describes the interactions of 5-50 keV energy He+ ions with solids, and predicts the production of ion induced secondary electron (iSE) emission. Its use to determine the most probable implant depth, the maximum ion range, and the effect of straggle are presented. IONiSE has been used to numerically fit literature tabulations of iSE generation from five elements so as to derive excitation energy and mean free path parameters. By employing those parameters in IONiSE the topographic yield variation for iSE as a function of energy and the atomic number of the target has been predicted, and estimates of the individual secondary electron contributions from the incident and backscattered ions have been made. These simulations help to create a foundation for the application and the interpretation of iSE images for metrology.

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