Auger-electron study of correlation effects in3d−1and4d−2states of Cs in atomic Cs and molecular CsI

High-resolution electron-beam-excited $M_{4,5}{N}_{4,5}{N}_{4,5}$ Auger-electron spectra of Cs have been measured and analyzed both from atomic Cs and molecular CsI vapors. The observed main fine structure is reproduced fairly well with the mixed-coupling calculations based on the closed-shell approximation. Some extra structure exists, which is stronger in the spectrum of molecular CsI than in the spectrum of atomic Cs. This structure is investigated by carrying out Dirac-Fock calculations for the energies of the Auger transitions locating the outermost electron either on the $6s$, $5d$, or $4f$ orbital.