New Window Resonances in the Potassium 3s Photoabsorption Spectrum

Abstract

The photoion spectrum of atomic potassium was measured over the 3s → np excitation region with the photoion time-of-flight method and monochromatized synchrotron radiation. An unusual spectrum with paired windows structure was found instead of a simple regular Rydberg series. Such subsidiary windows have not been observed in the 3s→ np resonances of Ar, which has a closed outer shell. Based on Dirac-Fock calculations, the dual window structure at 36.7 eV and at 37.4 eV was assigned to the 3s^-13p⁶4s4p resonance. The line shape can be fitted by Fano's formula and the Fano parameters were obtained.