Abstract
The expression is presented for XPS intensity excited by unpolarized excitation with account for octupole transitions. The non-dipole parameters including octupole transition parameters are calculated in relativistic treatment both for polarized and unpolarized excitations for atoms from Li to Ne. The calculations are performed for 1s shell (Mg Kα and Al Kα excitation, and for E kin=5000 eV and E kin=10,000 eV) and for 2s and 2p shells ( E kin=500 eV and E kin=1000 eV). The non-negligible contributions (up to 10%) for the XPS intensity are found for 1s shell when kinetic energy is 5000 and 10,000 eV. In other cases the octupole contributions are less then 1%.
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