Breakdown of the Independent Particle Approximation in High-Energy Photoionization
E. W. B. DiasDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaHimadri ChakrabortyDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaP. C. DeshmukhDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaSteven T. MansonDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaO. HemmersDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaP. GlansDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaD. L. HansenDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaHelen WangDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaS. B. WhitfieldDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaD. W. LindleDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaR. WehlitzDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaJ. C. LevinDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaI. A. SellinDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, IndiaR. C. C. PereraDepartment of Physics, Indian Institute of Technology—Madras, Madras 600036, India
1997en
ABI
Annotatsiya
The independent particle approximation is shown to break down for the photoionization of both inner and outer $n\ensuremath{\ell}$ $(\ensuremath{\ell}>0)$ electrons of all atoms, at high enough energy, owing to interchannel interactions with the nearby $\mathrm{ns}$ photoionization channels. The effect is illustrated for Ne $2p$ in the 1 keV photon energy range through a comparison of theory and experiment. The implications for x-ray photoelectron spectroscopy of molecules and condensed matter are discussed.
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