Showing papers on "Auger published in 1999"
TL;DR: The Pd3d5/2 binding energies are 335.4 eV and 336.8 eV for Pd and PdO respectively as mentioned in this paper, while the shape of the less intense M4,5N2,3N2.3 Auger peak, which implies only the Pd 3d and the pd4p core levels, does not change much.
473 citations
TL;DR: In this article, an analysis of the vortex motion in vertical or steeply inclined screw or auger conveyors is presented, which is characterised by the tangential component of the absolute grain velocity being substantially constant with the radial position of a point on the blade.
102 citations
TL;DR: In this paper, a systematic study of well-defined copper compounds was performed and characterisation of the copper LMM lines were analyzed. And they showed that the energy shift and the relative intensities of the Auger peak are good fingerprints of the oxidation state, and that the width of the Cu L3M 4,5M4,4,5,5 peak can be related to the width in the valence band.
42 citations
34 citations
TL;DR: In this article, the ratio of the s and d Auger-decay amplitudes and their phase difference for the resonant Auger transition 2p 3 24s! 3s213p214s 2P was determined from the measurement of the angular correlation between the resonance and the subsequent second-step Auger emission, as well as the angular distribution measurements for these two electron emissions.
Abstract: We have determined the ratio of the s and d Auger-decay amplitudes and their phase difference for the resonant Auger transition 2p 3 24s ! 3s213p214s 2P from the measurement of the angular correlation between the resonant Auger emission and the subsequent second-step Auger emission, as well as the angular distribution measurements for these two electron emissions. The analysis of the experimental data is based on the nonrelativistic LSJ coupling approximation.
34 citations
TL;DR: The N 4,5 OO Auger spectrum of xenon has been measured at several photon energies using synchrotron radiation as mentioned in this paper, and the results of the Hartree-Fock and previously published Dirac Fock calculations were compared.
33 citations
TL;DR: In this article, anisotropy parameters extracted from angle-resolved spectra show variations within the vibrational envelopes of the participator Auger decay and exhibit a complex oscillating behavior for the spectator Auger transitions.
Abstract: Auger electron spectra from the decay of the ν=0, 1, and 2 levels of the C 1s−12π* state were measured with sufficiently high electron and photon energy resolution to completely resolve the vibrational structure of the final electronic states. The results are compared with ab initio calculations with emphasis on the analysis of the spectator Auger transitions. The anisotropy parameters extracted from angle-resolved spectra show variations within the vibrational envelopes of the participator Auger decay and exhibit a complex oscillating behavior for the spectator Auger transitions. In addition, two-dimensional (2D) imaging of the electron emission across the C 1s−12π* resonance was performed. The ratio of resonant and nonresonant ionization processes is estimated from the 2D map. Strong vibrational lifetime interference effects apparent in the 2D imaging are discussed.
32 citations
TL;DR: In this paper, the Auger parameters of the elements of interest between unalloyed and alloyed conditions were used to calculate values of charge transfer occurring upon alloying, which were related to thermodynamic predictions and the microstructures of the two alloys.
32 citations
TL;DR: In this article, the dependence of relative partial electron density at the oxygen ions with the intensity of Auger O KLL lines in Bi O 3, Al 2 O 3, SiO 2 and UO 2 has been determined by Auger and X-ray photoelectron spectroscopic methods.
26 citations
TL;DR: In this article, an Auger decay spectrum of the resonantly excited Xe 4d 5/2 −1 6p state was obtained under resonant Raman conditions, with a bandwidth of ≈6 meV for the exciting radiation, much smaller than the natural lifetime width of 110-120 meV.
24 citations
TL;DR: In this paper, a resonant cascade model based on a stepwise approach is suggested for the analysis of the angular correlation in the decay of core-excited atomic resonances produced by photoabsorption.
Abstract: A resonant cascade model based on a stepwise approach is suggested for the analysis of the angular correlation in the decay of core-excited atomic resonances produced by photoabsorption. The model is applied to the description of angular distributions of resonantly enhanced Auger electrons and fluorescence. The relation of the model with a more rigorous approach based on Fano theory is discussed. Examples of Auger cascade transitions in photoexcited Ar and Ca atoms are considered and in the latter case compared with experiment.
TL;DR: In this article, the authors discuss the possible evaluation routines for Auger depth profiling and demonstrate the performance of a novel evaluation routine based on TRIM simulation, which can deduce data concerning atomic mixing.
TL;DR: In this paper, the surface mass transport diffusion coefficients were determined and they were in the range 10−15-10−17 m2−s−1 in the investigated temperature interval.
TL;DR: In this paper, a strong and anomalous dispersion is found for the resonant Si-KLL Auger peak, probably associated to Si + species, when the photon energy is increased across the SiK edge.
ENEA1
TL;DR: In this paper, the pπ*pπ self-fold contribution of the CKVV Auger spectrum to the X-ray excited Auger electron spectroscopy (XAES) data has been investigated.
TL;DR: Auger photoelectron coincidence spectroscopy (APECS) is a technique that provides us with unique information and a chance to gain insight into the significance of processes in the Auger spectra of atoms in solids as discussed by the authors.
TL;DR: In this paper, the electron-impact excitation of the chlorofluorocarbon molecules CF 3 Cl, CF 2 Cl 2 and CFCl 3, as well as the F, N and C KVV Auger spectra of the CF 3 CN molecule, have been interpreted with the help of ab initio calculations for the local density of states.
TL;DR: In this paper, the incident electron beam effects for energies 0.5-2 kV, measured by Auger and elastically backscattered electrons, were investigated experimentally and theoretically for the (0, 0, 1), (1, 1, 1) and (1, 1, 0) Cu crystals.
TL;DR: In this article, a threshold photoelectron spectrum and its component spectra of Auger cascades following Kr-shell photoionization have been measured by a threshold-electron-ion coincidence technique.
Abstract: A threshold photoelectron spectrum and its component spectra of Auger cascades following Kr -shell photoionization have been measured by a threshold photoelectron-ion coincidence technique. These spectra exhibit characteristic profiles of post-collision interaction effects induced by the Auger cascades. Peak shifts of the profiles increase gradually according to the times of the interactions, but peak widths of the profiles are almost independent of the times of interactions. These characteristics are analysed in terms of a simple model based on the assumption that double-Auger (Auger shake-off) decays reduce the effective number of steps of the Auger cascades.
TL;DR: In this paper, the spin polarization of the Xe N4,5 O2,3 O2-3 Auger lines was measured after ionization by circularly polarized synchrotron radiation of 93.8 eV photon energy.
Abstract: The spin polarization of the Xe N4,5 O2,3 O2,3 Auger lines was measured after ionization by circularly polarized synchrotron radiation of 93.8 eV photon energy. The circularly polarized radiation was produced by converting the linearly polarized light from a conventional undulator by a Mo/Si transmission multilayer acting as a quarter-wave plate. Nearly perfect circular polarization was obtained. In the framework of the two-step model of Auger decay the orientation of the primary hole states 4d-1 2D3/2 and 4d-1 2D5/2 can be derived from the spin polarization of the 1S0 Auger lines. Furthermore, the intrinsic parameters for all lines in this Auger group corresponding to the other 5p-2 final states are determined and compared with theory.
03 Jun 1999-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this article, the proton excited carbon and oxygen K-LL Auger spectra of carbon dioxide were measured using the high-resolution, angular resolving ESA-21 electron spectrometer.
Abstract: The proton excited carbon and oxygen K–LL Auger spectra of carbon dioxide were measured using the high-resolution, angular resolving ESA-21 electron spectrometer. The proton impact energy was 1.0 MeV. The transition energies of both K–LL Auger-spectra (oxygen and carbon) are determined and compared with the existing theoretical and earlier experimental data. The experimental line widths full width at half maximum (FWHM) and relative intensities of the Auger lines are determined. The Auger emission was found to be isotropic within the experimental accuracy.
TL;DR: The Ellog auger is a continuous flight, hollow-stem auger with integrated electrical and gamma logging tools as mentioned in this paper, which is used for hydraulic data collection during auger drilling in unconsolidated sediments.
Abstract: The Ellog auger drilling method is an integrated approach for hydrogeological data collection during auger drilling in unconsolidated sediments. The drill stem is a continuous flight, hollow-stem auger with integrated electrical and gamma logging tools. The geophysical logging is performed continuously while drilling. Data processing is carried out in the field, and recorded log features are displayed as drilling advances. A slotted section in the stem, above the cutting head, allows anaerobic water and soil-gas samples to be taken at depth intervals of approximately 0.2 m. The logging, water, and gas sampling instrumentation in the drill stem is removable; therefore, when the drill stem is pulled back, piezometers can be installed through the hollow stem. Cores of sediments can subsequently be taken continuously using a technique in which the drill bit can be reinserted after each coring. The Ellog auger drilling method provides detailed information on small-scale changes in lithology, sediment chemistry, and water, as well as gas compositions in aquifer systems–data essential to hydrogeological studies.
TL;DR: In this paper, angle-resolved results for resonant Auger transitions of CO were presented, where the excitation of the electronic state is performed by linearly polarized photons.
Abstract: In this paper we present angle-resolved results for resonant Auger transitions of CO. The excitation of the electronic state is performed by linearly polarized photons. Comparison between our calculations and the experiments of Hemmers et al (1993 Phys. Rev. Lett. 71 987) shows good agreement.
TL;DR: In this paper, a strong alternation of Auger electron angular distributions is observed for the second-step Auger emission of Ar following 2p3/24s and 2p1/ 24s excitation, which gives rise not only to anisotropy suppression but also to strong enhancement.
Abstract: A strong alternation of Auger electron angular distributions is observed for the second-step Auger emission of Ar following 2p3/24s and 2p1/24s excitation. This effect, which gives rise not only to anisotropy suppression but also to the strong enhancement, is shown to originate from a coherent population of the Auger initial state due to the short decay time of the second-step Auger transition, the so-called lifetime interference effect.
TL;DR: In this article, the angle-resolved Kr L 2,3M4,5M 4,5m 4, 5 Auger spectra induced by proton impact ionization were measured at 1, 26 and 36 MeV proton energies where high-resolution spectroscopy techniques have been applied.
Abstract: The angle-resolved Kr L2,3M4,5M4,5 Auger spectra induced by proton impact ionization were measured at 1, 26 and 36 MeV proton energies where high-resolution spectroscopy techniques have been applied The Auger energies and relative line intensities are compared with different earlier experimental data as well as our numerical results which have been obtained within a multiconfigurational Dirac-Fock approach The alignment parameter 20 of the singly ionized krypton atoms has been extracted from the experimentally accessible anisotropy parameter A2 applying a special method, using the theoretical values of the angular distribution parameter 2
TL;DR: In this article, simple propensity rules are derived which allow predictions for a large dynamic spin polarization of Auger electron(s) emitted in resonantly excited Auger transitions, and the effect of a large spin polarization is caused by a large shift of the scattering phase of the emitted s 1/2 partial waves.
Abstract: Simple propensity rules are derived which, for the first time, allow predictions for a large dynamic spin polarization of Auger electron(s) emitted in resonantly excited Auger transitions. Our predictions are in accordance with multiconfigurational Dirac-Fock calculation(s) for the resonant Xe*(6p3/2)N5O2,3O2,3 and Ar*(4s1/2)L3M2,3M2,3 Auger multiplets. It is demonstrated that the effect of a large spin polarization is caused by a large shift of the scattering phase of the emitted s1/2 partial waves, whereas a small spin polarization is due to a cancellation between the Coulomb and scattering phases of the partial waves. Our results are in accordance to recent experiments for the resonant Xe*(6p3/2)N5O2,3O2,3 Auger spectrum. Auger transitions are given for which a large dynamic spin polarization is predicted.
TL;DR: In this paper, the satellite structures revealed in the spectra were compared to the structures obtainable on the basis of the spectator vacancy model for the case of these metals and alloys, and it was shown that the KLL satellites can be attributed to intra-atomic 3D shake-up processes.
TL;DR: In this paper, the angular distribution and spin polarisation of the resonantly photoexcited Xe¤(4d-15/2 6p3/2 ) N5O2,3O2-3 Auger spectrum is investigated.
Abstract: The angular distribution and spin polarisation of the resonantly photoexcited Xe¤(4d–15/2 6p3/2 ) N5O2,3O2,3 Auger spectrum is investigated. The two-step model has been used which allows us to independently determine the dynamic parameters of the primary excitation and the Auger emission process. Assuming either a fully circularly or linearly polarised photon beam the dynamic parameters determining the primary photoexcitation become constant numbers independent of the matrix elements. Applying a relativistic distorted wave approximation the relevant numbers describing the Auger decay dynamics, i.e. relative intensities, angular distribution and spin polarisation parameters have been calculated, and are compared with experimental and other theoretical data. With this, predictions for the spin polarisation vector are possible. A large degree of dynamic spin polarisation has been found for all Auger transitions to a final state with Jf = h . This is in contrast to earlier calculations for diagram Auger transitions. Recently, we have given an explanation for this deriving propensity rules for resonant Auger transitions. The propensity rules allow for predictions for which Auger line a large dynamic spin polarisation can be expected. The predictions are in accord with our multiconfigurational Dirac–Fock calculations for the resonant Xe N5O2,3O2,3 and Ar L3M2,3M2,3 Auger multiplets. It is demonstrated that the effect of a large spin polarisation is caused by a large shift of the scattering phase of the emitted es1/2 partial waves, whereas a small spin polarisation is due to a cancellation between the Coulomb and scattering phases of the partial waves.
TL;DR: In this paper, the authors measured the resonant Auger decay spectrum of the water molecule at the oxygen K edge and observed strong deviations from the expected linear dispersion of the participator lines (which correspond to single-hole valence states).
Abstract: We have measured the resonant Auger decay spectrum of the water molecule at the oxygen K edge. Strong deviations from the expected linear dispersion of the participator lines (which correspond to single-hole valence states) are observed. In a simplified picture the effect can be attributed to the combined effect of the intermediate- and final-state potential curves.