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The state-resolved differential cross sections for both the 1s2 1S0 - 1s2s1S0 monopolar transition and the 1s2 1S0 - 1s2p 1P1 dipolar transition ofatomic helium have been measured over a large momentum transfer region by thehigh-resolution inelastic X-ray scattering (IXS) for the first time. The almostperfect match of the present measurement with the theoretical calculationsgives a stringent test of the theoretical method and the calculatedwavefunctions. Our results demonstrate that high-resolution IXS is a powerfultool for studying the excitations in atoms and molecules.

High-resolution inelastic X-ray scattering studies of the state-resolved differential cross-section of Compton excitations in helium atoms