Relaxation during photoemission and LMM Auger decay in arsenic and some of its compounds

Abstract

The energies of the 2p1/2, 2p3/2, 3s, 3p1/2, 3p3/2, and 3d3/2,5/2 photopeaks and of the L2,3M4,5M4,5 Auger peaks have been measured for arsenic metal and 19 of its compounds. By comparing the photopeak and Auger chemical shifts, the changes in the total (static) relaxation energies were determined. It was found that the relaxation energy change provides a useful parameter for characterizing nearest neighbor groups and that electronegativities derived from them offer the advantages that they are independent of the energy reference level and of charging effects.

A proposed new type of arsenian pyrite: Composition, nanostructure and geological significance

“…4a) shows a best fit when As 2+ , As 3+ and As 5+ peaks are used in the model. The largest contribution to the As 3d peak comes from As 3+ peak at 44.4 eV which is in close agreement to the E B reported for As 3+ from the oxidized surface of FeAsS and bulk of As 2 O 3 (Bahl et al, 1976;Schaufuss et al, 2000). The contributions (%) from As 2+ , As 3+ , and As 5+ to the As 3d peak are 6.6%, 53.2% and 40.2%, respectively.…”

Photoelectron core levels for enargite, Cu3AsS4

“…Arsenic in enargite is formally As(V). The binding energy is ¾3 eV lower than that reported for oxygen-bearing As(V) species such as As 2 O 5 46.1 eV 15 . This difference in binding energies for As(V) is most likely related to a matrix effect where coordination number, bond length and the atom species of the nearest neighbours, rather than formal oxidation state, determine the extent of shielding of the nuclear core and the binding energy of the ejected photoelectron.…”

Natural manganese oxide: Combined analytical approach for solid characterization and arsenic retention

“…Curve fitting of the As3d core level and corresponding results of deconvolution are given in Figure 10 and in Table 4 respectively. Deconvolution has been conducted without considering the splitting of the As3d in two components As3d 5/2 and As3d 3/2 (⌬BE ϭ 0.4 -0.5 eV, ratio ϭ 0.66) (Bahl et al, 1976) because the 3d 5/2 and 3d 3/2 state are note resolved for arsenic in positive oxidation states (Lange et al, 1991). Fit results ( Fig.…”