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The dynamic structure factor S(→q,ω) of electrons in solid 4He was measured with 1.6 eV energy resolution by means of inelastic scattering of synchrotron x rays from a hcp single crystal for →q along the c axis and for q=0.45,0.97,and1.24a.u. The hcp crystal was grown in situ at 61.5 MPa and 4.3 K. A q-independent energy loss peak at 21.9±0.3eV could unambiguously be identified. These signals are the first directly measured electronic excitations in solid helium. They are discussed in terms of excitonic excitations

physical review letters

Electronic Excitations in hcp<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>He at 61.5 MPa and 4.3 K Studied by Inelastic X-Ray Scattering Spectroscopy

Electronic Excitations in hcp4He at 61.5 MPa and 4.3 K Studied by Inelastic X-Ray Scattering Spectroscopy