Generation of L sub-shell photo-ionization cross-sections for elements 18?Z?92 at energies .320-115.606 keV (A computer program ‘LSPICS’)

L sub-shell photo-ionization cross-sections, σ_Li, for elements 18?Z?92 at energies .320-115.606 keV have been generated from an empirical relation fitted to Scofield's L sub-shell photo-ionization cross-section values. The excitation energy E for an element is constrained by the condition that only L and higher shell vacancies are produced in the elements. The closeness of generated and existing values of Scofield's L sub-shell data recommends the use of generated values in the fields of atomic and molecular physics and for trace elemental analysis. For this purpose computer software ‘LSPICS’ has been developed. On personal computer LSPICS generates L sub-shell photo-ionization cross-section values in barns just by entering the atomic number of element and excitation photon energy in keV.