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Range and Energy Straggling in Ion Beam Transport
John W. Wilson
出版
NASA
, 2000
URL
http://books.google.com.hk/books?id=QgEVAQAAIAAJ&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
A first-order approximation to the range and energy straggling of ion beams is given as a normal distribution for which the standard deviation is estimated from the fluctuations in energy loss events. The standard deviation is calculated by assuming scattering from free electrons with a long range cutoff parameter that depends on the mean excitation energy of the medium. The present formalism is derived by extrapolating Payne's formalism to low energy by systematic energy scaling and to greater depths of penetration by a second-order perturbation. Limited comparisons are made with experimental data.