Photoabsorption Spectra for Lithium Atom in Parallel Electric and Magnetic Fields

Key words: 
• closed-orbit theory /
• recurrence spectrum /
• region-splitting consistent and iterative method /
• core-scattering

Abstract: By employing the semiclassical closed-orbit theory including core-scattering and region-splitting consistent iterative method, we calculate the closed-orbits and the recurrence spectra of n≈40, m=0 Li Rydbergatom in parallel electric and magnetic fields at scaled energy ε=-0.03. The constant scaled electric field is =0.01 . The novel spectral structures are compared with those of hydrogen obtaines by standard closed orbit theory. The effect of the core-scattering has been discussed.