Abstract
Determination of the Mean Excitation Energy of Materials for Projectile Stopping Power
Highlights
Understanding of the details of the deposition of energy by a swift ion in materials is important to the understanding of many processes, from radiation treatment of tumors to interaction of molecules in space with the solar wind
Of the quantities in Eq.5, the critical quantity is the mean excitation energy of the target, I0, which is defined [1] as the first energy weighted moment of the target dipole oscillator strength distribution (DODS): ln df ln E dE dE
The mean excitation energy is characteristic of the target only, and has no dependence on the properties of the projectile ion. (One should note parenthetically that if the target is in an excited electronic state before the collision, the projectile might absorb energy from the target [1].) As the mean excitation energy enters the stopping power expression under the logarithm and in atomic units, small changes in mean excitation energies do not produce major changes in the stropping cross section [6 ]
Summary
Understanding of the details of the deposition of energy by a swift ion in materials is important to the understanding of many processes, from radiation treatment of tumors to interaction of molecules in space with the solar wind. Where S (v) is referred to as the stopping cross-section of the target. The mean excitation energy describes how a target, typically a molecule or atom can absorb kinetic energy from the projectile, primarily as electronic (including ionization) and vibrational (including fragmentation) excitation.
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