Very strong correlation effects in auger spectra through the collapse of d orbitals: the 2p auger spectrum of free Ca atoms

Electronic decay processes of photoexcited 2presonances of atomic Ar, K, and Ca

“…7(d); 80 eV&E& &100 eV] and their relative intensities are almost identical to those found in the Auger spectra excited by electron impact [58]. This is interesting because Weber et al [58] [Ek;") 283 eV, i.e. , in Fig.…”

“…The line positions of the individual components of the L &3M&3M&3 Auger structure in the kinetic-energy region 270&Ek;"&290eV [in Fig. 7(d); 80 eV&E& &100 eV] and their relative intensities are almost identical to those found in the Auger spectra excited by electron impact [58]. This is interesting because Weber et al [58] [Ek;") 283 eV, i.e.…”

“…In addition the elaborate study of the L Auger spectra excited by electron bombardment [58] and the first results for the autoionization of the strong Ca* 2p 3d4s core resonances [19]demonstrate the important role of the 3d wave function also in the case of 2p excitations. For the interpretation of the line structures of the Auger and autoionization spectra a strong mixing as well in the initial as in the final state had to be taken into account.…”

Effects of electron correlation on the level widths, the photoelecton, Auger electron and ion-yield spectra above the 4d threshold in Ba

“…For the 3d −1 → 4d −2 AES it was found that basis sets with 6s 2 , 6s 1 5d 1 , 5d 2 valence configurations both in initial ionic state as well as in final ionic state are needed to arrive at a reasonable agreement between theory and experiment [9]. Related phenomena were found in other alkaline-earth-metal spectra [10]. Mäntykenttä and co-workers studied the finestructure in the 4d, 5s, and PES and 4d −1 → 6s −2 AES theoretically using multiconfiguration Dirac-Fock calculations (MCDF) [4,11].…”

Single ionization of calcium by electron impact

“…The only electron impact experimental studies in the 3p autoionization region are by Schmitz et al [22], Pejčev et al [23] and, more recently, Feuerstein et al [24]. In the 2p autoionization region measurements have been conducted by Weber et al [25] and Chen et al [26].…”