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We report non-resonant x-ray Raman scattering (XRS) measurements fromhexagonal boron nitride for transferred momentum from 2 to 9$\mathrm{\AA}^{-1}$ along directions both in and out of the basal plane. Asymmetry-based argument, together with real-space full multiple scatteringcalculations of the projected density of states in the spherical harmonicsbasis, reveals that a strong pre-edge feature is a dominantly $Y_{10}$-typeFrenkel exciton with no other \textit{s}-, \textit{p}-, or \textit{d}-components. This conclusion is supported by a second, independent calculationof the \textbf{q}-dependent XRS cross-section based on the Bethe-Salpeterequation.

Exciton spectroscopy of hexagonal boron nitride using non-resonant x-ray Raman scattering