Normal Auger Electron Research Articles

Decay channels of core-excited H2S studied by synchrotron-radiation-excited photoelectron spectroscopy.

The 2p(3${\mathit{a}}_{1}$) to 6${\mathit{a}}_{1}$ and 3${\mathit{b}}_{2}$ photoexcitation resonance of ${\mathrm{H}}_{2}$S has been studied using synchrotron-radiation-excited photoelectron spectroscopy. The overall shape of the measured photoelectron spectrum of ${\mathrm{H}}_{2}$S is found to be in close resemblance with the normal Auger-electron spectrum of HCl. The spectrum is assumed to result mainly from the Auger decay in the excited HS molecule taking place after the molecular dissociation of the excited ${\mathrm{H}}_{2}$S molecule. The finding is compared with the results of multiconfiguration self-consistent-field calculations [A.N. de Brito and H. Agren, following paper, Phys. Rev. A 45, 7953 (1992)].

The N 1s core electron shake-up and the shake-up Auger satellite spectrum of the N2 molecule

The shake-up Auger satellite spectrum associated with the N 1s Auger spectrum of N2 is recorded using monochromatized X-ray excitation. As many as 11 structures are observed in the spectrum. Assignments in terms of participator and spectator processes are discussed based on data from normal Auger and shake-up spectra and from a simple one-particle model. The interpretation is assisted also by a new N 1s photoelectron shake-up spectrum showing several hitherto unobserved details. A new X-ray excited normal Auger electron spectrum of N2 is also presented.

Electron spectroscopy of europium

Electron emission spectra of Eu, EuAl2 and Eu2O3 arising from excitation of the europium 4d subshell by 0.5-5 keV electron impact and Al K alpha X-radiation have been compared. The electron-impact-excited emission structure has been assigned primarily to the N45O23O23, N45O23N67 and N45N67N67 normal Auger transitions and the 4f(4d from 4f) direct recombination process; Auger transitions with a 4, in f spectator electron and the 5p(4d from 4f) direct recombination process appear to be of secondary importance. Europium 4d to 4f giant resonance excitation has been monitored by electron energy loss spectroscopy and correlated with the direct recombination features. The electron emission excited by Al K alpha X-radiation has been shown to be predominantly due to Auger transitions with a spectator vacancy: N45N-NO23O23, N45N-NO23N67 and N45N-NN67N67. Argon-ion bombardment of europium has been found to excite normal 4d-based Auger electron emission but not direct recombination electron emission.

Study of Surface Composition of Iron-Based Metallic Glasses by Means of UV Photoemission, Angle-Resolved Auger Electron and Ion Scattering Spectroscopy

Two different attempts have been made to obtain information on surface concentration, concentration gradients, segregation effects and surface contamination of metallic glasses. (i) Angle-resolved Auger electron spectroscopy and variation of the observation angle was applied to Fe81.5B14.5Si4 and (ii) ion scattering spectroscopy in combination with normal emission UV photoelectron and Auger electron spectroscopy to Fe75B25.