Photoemission of LaI2 and CeI2

The electronic structure of the layered compounds LaI₂ and CeI₂ was investigated by photoemission and electron energy loss spectroscopy. From the experimental results we are able to confirm the metallic nature of these compounds, and by using photon energy dependent measurements of the valence band we can identify the orbital character of the conduction band as essentially 5d¹-like. A detailed analysis of the Ce 3d and 4f spectra yields a remarkably small 4f-5d hybridization strength, almost completely decoupling the f-electron from the conduction band, which makes CeI₂ a somewhat unusual system compared to other metallic Ce compounds. Band structure calculations by Jepsen and Andersen [1] confirm these experimental results.     

The transverse momentum profile of a quark jet

The first and second moments of the transverse momentum distribution of pions ine ⁺ e ^?-annihilation at fixed longitudinal momentum with respect to the jet axis are discussed, treating the hadronic final state evolving from the 2-quark system in the framework of a fireball-model. Good agreement with the published data is found. A comparison with thep _T -distribution of electroproduction is made, showing qualitative agreement. This casts serious doubts on previous conclusions favoring a large partonk _T inside the proton.     

Core-level binding energy shifts in dilute alloys

Core level binding energy shifts for the element A of a large number of dilute alloys AB have been measured, where the concentration of the dilute component A is 10% or less. The experimental shifts are analysed in terms of alloy heat of formation data, for which we have used Miedema's semi-empirical scheme. Good overall agreement is obtained between the experimental data and the calculated values, encouraging the use of electron spectroscopy for evaluating solution energies of metallic systems.     

Wide-angle high-energy proton spectra by 800 MeV/A C,Ne, and Ar beams

Inclusive proton spectra, as well as two-particle correlations, resulting from collisions between energetic nuclei have been measured. Protons associated with large momentum transfers show exponential-type energy distributions having a decay constant about (70–90 MeV)^?1. For light-mass targets a strong two-particle correlation has been observed, which is kinematically consistent with quasi-elastic pp scatterings.     

Bemerkungen zum Trapezdesargues

Ohne Zusammenfassung     

Synthesen von Heterocyclen, 54. Mitt.: Über umsetzungsprodukte aus Xanthogenamid und Malonsäurederivaten

Zusammenfassung Xanthogenamid reagiert mit Malonsäure und PCl₃ zu 2,4-Dihydroxy-5-acetyl-[1,3-thiazinon-(6)] (IV), mit Malonylchlorid hingegen zu 2-Äthoxy-4-hydroxy-[1,3-thiazinon-(6)] (VII).