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Binary collision theory has been widely used in this context due to its computational convenience, despite its wellknown simplistic description of the materials excitation properties. 20 In the present work, we advance a MC model of electron-beam energy dissipation in multi-walled carbon nanotube (MWCNT) materials based on a quasi firstprinciples discrete-energy-loss model deduced from a realistic description of the target electronic excitations. This approach has the advantage that secondary-electron cascade generation can be explicitly simulated without the need for an arbitrary separation of plasmon and single-particle losses, since the complete excitation spectrum of MWCNTs is builtinto the model via the energy (x) and momentum () dependent dielectric response function, eðx;kÞ. Then, under the constraint of physically motivated sum-rules (which preserve causality), the energy losses in single inelastic collisions can be computed in a self-consistent manner according to the properties of the so-called energy-loss-function (ELF), Im½ 1=eðx;kÞ .

Quasi first-principles Monte Carlo modeling of energy dissipation by low-energy electron beams in multi-walled carbon nanotube materials