Molecular-orbital model for the chemical effect on theK-x-ray spectrum of fluorine

A new model based on the linear combination of atomic orbitals molecular-orbital wave functions is proposed to explain the reduction of the relative intensity of the fluorine ${\mathrm{KL}}^1$ satellite line in covalent fluorine compounds. Values of a reduction factor r of the ${\mathrm{KL}}^1$ line intensity are calculated and compared with experimental ones. Agreement is found for the size of the factor, but problems are found in use of the Pauling crystal ionicity to characterize molecular orbits. In addition, it is shown that the same effects are expected for direct and shakeoff multiple ionization in application of the sudden approximation method to molecular wave functions.