Inelastic x-ray scattering study of the state-resolved differential cross section of Compton excitations in helium atoms

B. P. Xie, L. F. Zhu, K. Yang, B. Zhou, N. Hiraoka, Y. Q. Cai, Y. Yao, C. Q. Wu, E. L. Wang, D. L. Feng
2010 Physical Review A. Atomic, Molecular, and Optical Physics  
The state-resolved differential cross sections for both the 1s2 1S0 - 1s2s 1S0 monopolar transition and the 1s2 1S0 - 1s2p 1P1 dipolar transition of atomic helium have been measured over a large momentum transfer region by the high-resolution inelastic X-ray scattering (IXS) for the first time. The almost perfect match of the present measurement with the theoretical calculations gives a stringent test of the theoretical method and the calculated wavefunctions. Our results demonstrate that
more » ... onstrate that high-resolution IXS is a powerful tool for studying the excitations in atoms and molecules.
doi:10.1103/physreva.82.032501 fatcat:ogxywn5ckretvir4a54whk35yy