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It is demonstrated that the bootstrap kernel [\onlinecite{sharma11}] forfinite values of ${\bf q}$ crucially depends upon the matrix character of thekernel and gives results of the same good quality as in the ${\bf q}\rightarrow 0$ limit. The bootstrap kernel is further used to study theelectron loss as well as absorption spectra for Si, LiF and Ar for variousvalues of ${\bf q}$. The results show that the excitonic effects in LiF and Arare enhanced for values of ${\bf q}$ away from the $\Gamma$-point. The reasonfor this enhancement is the interaction between the exciton and high energyinter-band electron-hole transitions. This fact is validated by calculating theabsorption spectra under the influence of an external electric field. Theelectron energy loss spectra is shown to change dramatically as a function of${\bf q}$.

Enhanced excitonic effects in the energy loss spectra of LiF and Ar at large momentum transfer