Satellite structures of Kr and Xe studied by high-resolution threshold photoelectron spectroscopy

A high-resolution threshold photoelectron spectrum of Xe was measured in the photon energy region of the 5s25p4nl states. The peak width of the measured Xe 5s−1 main line was close to 5 meV. A previously measured spectrum of Kr was also analysed. Rich satellite peaks were clearly observed, including many peaks not observed in previous optical, photoelectron and threshold photoelectron studies. The satellite peak energies and their assignments for Kr and Xe are listed. The observed Rydberg series converging to the Xe2+ ground state was assigned to the (3P2)ng series by detailed analysis. The energy level of the Xe2+ 3P2 state as the converging limit of the observed Rydberg series was obtained as 38.355 eV.