X-ray photoemission spectra of valence electrons in V3X and Nb3X compounds

The X-ray photoemission spectra (XPS) of the A15 type compounds V₃Au, Nb₃Os, Nb₃Ir, Nb₃Pt and Nb₃Au have been studied. The inner level binding energies of the different components and the valence electron distribution were measured. The Nb4d and the X5d energy bands of the Nb₃X compounds appear to be more and more separate with increasing atomic number of the X component. The comparison between the results from X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy (XPS) of corresponding V₃X and Nb₃X compounds points out the similarity of their electronic structures.     

Eine Charakterisierung von Dini-Verbänden

Ohne Zusammenfassung     

The total hadronic cross section for e+e− annihilation between 3.1 and 4.8 GeV center of mass energy

Using the solenoidal magnetic detector PLUTO, we have measured the total cross section for e⁺e^? annihilation into hadrons. Results are presented for center of mass energies between 3.6 and 4.8 GeV, and in the regions of the $\text{J}\text{ψ}$(3.1) and ψ(3.7) resonances. We also present results for the 2 prong cross section in the energy range 3.6 to 4.8 GeV.     

Experimental results on diffractive one-pion production at the CERN ISR

New experimental results are reported on diffractive dissociation of protons into (nπ⁺) in proton-proton collisions at a centre-of-mass energy of $\text{s}\text{= 45}\text{GeV}$. The data were obtained using the Split-Field-Magnet detector at the CERN Intersecting Storage Rings. We have searched for resonance contributions and found peaks at mass values of 1.5 GeV, 1.65 GeV, and 2.1 GeV. A dip in $\text{d}\text{σ}\text{d}\text{t}$ is observed at low t and low mass; it is most pronounced for events with neutrons emitted at 90° in the Gottfried-Jackson frame. The correlation between mass and slope depends strongly on θ_J. The cross section of the channel pp → pnπ⁺ is 400 ± 110 μb at $\text{s}\text{= 45}\text{GeV}$, giving an energy dependence of s^?0.30±0.07 for isospin exchange zero in this channel.     

Der Grenzübergang zum starren Körper für das quantenmechanische Dreikörperproblem

It is a well known difficulty to introduce the concept of rigid body into quantum mechanics. The authors show how this problem may be solved rigorously for three particles by using a suitable set of coordinates. After subjecting the hamiltonian to a canonical transformation, the coupling term of rotational and vibrational motion vanishes in the limit of infinitesimal vibrational amplitudes, making them separable and thus leading back toWang's naïve quantum theory of the rigid body rotations.     

Beiträge zur Chemie der Pyrrolpigmente, 80. Mitt. Synthese,Struktur und Transporteigenschaften von Hexapyrrinanaloga

Summary A 15-thia- and a 15-nor hexapyrrin derivative were prepared. Their structural features were analyzed by¹H-NMR and absorption spectroscopy. All-(Z) configurations and all-syn conformations were found throughout. Carrier mediated transport efficiencies of these compounds in bulk membranes were studied and compared with those of a recently synthesized pentapyrrin-dione and their tripyrrinone partial structure. The pentapyrrin-dione derivative turned out to be one of the most efficient Hg(II) carriers known so far.

     

A study of the charge-exchange reaction pp → nΔ++(1232) at ISR energies

We report on a study of the charge-exchange reaction pp → nΔ⁺⁺(1232) at the CERN intersecting storage rings (ISR) in the energy range √s = 23 to 53 GeV. From our analysis of the energy dependence of the total cross-section, of the differential cross-section dσ/dt and of the decay angular distributions we find evidence that pion exchange is dominant up to √s = 23 GeV and that (?+A₂) exchange dominates the reaction for √s ? 30 GeV, as described by simple Regge-pole models.     

Zur Theorie desppμ-Molekülions

Using the variational method developped in the preceding paper ofDiehl andFlügge, the binding energy and molecular parameters of the muon molecule ppΜ have been calculated. The vibrational amplitudes of the protons turn out to be much larger in comparison to their equilibrium distance than in the electronic molecule H ₂ ⁺ . The equilibrium distance is about 40% larger than it would have come out from a simple two-center calculation with fixed nuclei. A dissociation energy of 211 ev has been found; this value may be enlarged by something between 10 and 20 ev in consequence of plausible corrections.     

Measurement of e+e−→τ+τ− at high energy and properties of the τ lepton

The e⁺e^?→τ⁺τ^? process has been measured using the CELLO detector at a mean total centre of mass energy of 34.2 GeV using essentially all the decay channels of the τ lepton. The measured cross section yields R_τ=1.03±0.05 (stat)±0.07 (syst). Topological branching fraction are given for τ → 1, 3 or 5 charged tracks. The angular distribution shows a clear 1 + cos²θ dependance with a forward-backward asymmetry of -0.103 ± 0.052 corresponding to an axial-vector coupling a_τ of the τ to the weak neutral current given by a_τ=?1.12 ± 0.57.     

Die derivatographische Prüfung der Reaktion von Kobalt(III)-hexamminchlorid mit Alkalinitraten

Zusammenfassung Die derivatographische Untersuchung von Gemischen aus Kobalt(III)-hexamminchlorid und Nitraten des Li, Na, K, Cs bzw. NH₄ ergab, daß die komplexe Verbindung mit den Alkalinitraten in Reaktion tritt, wobei ein gemischter Komplex der Zusammensetzung [MeCo(NH₃)_{1, 5}NO₃ · C1]C1₂ entsteht. Diese Annahme wurde teils durch stöchiometrische Berechnungen aus den derivatographischen Kurven, teils nach Erhitzen solcher Verbindungen, die Alkalinitrat in verschiedenen Mengen enthalten, durch Bestimmung des Ammoniak- und Stickstoffgehaltes des Rückstandes erwiesen. Es wurde festgestellt, daß die entstandene neue Verbindung bei niedrigerer Temperatur zersetzt wird als die einzelnen reinen Mischungskomponenten. Im Falle eines Kaliumnitratüberschusses spielt sich die Reaktion nach einem anderen Mechanismus ab, als im Falle eines Überschusses an Kobalt(III)-hexamminchlorid.

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Summary The derivatographic investigation of mixtures of cobalt(III) hexammine chloride and nitrates of Li, Na, K, Cs, NH₄ showed that the complex compound reacts with the alkali nitrates to yield a mixed complex of the composition [MeCo(NH₃)_{1, 5}NO₃ · C1]C1₂. This assumption was supported in part by stoichiometric calculations from the derivatographic curves, in part by heating such compounds as contain the alkali nitrate in various amounts, and by determining the ammonia and nitrogen contents of the residue. It was found that the resulting new compound is decomposed at a lower temperature than the individual pure components of the mixture. In the case of an excess of potassium nitrate, the reaction follows another mechanism as compared with that prevailing with an excess of cobalt(III) hexammine chloride.

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Résumé L'étude dérivatographique de mélanges de chlorure de cobalt-III hexammine, et de nitrates de Li, Na, K, Cs ou NH₄, a montré que la combinaison complexe avec les nitrates alcalines entre en jeu et conduit à la formation d'un complexe mixte de composition [MeCo(NH₃)_{1, 5}NO₃·C1]C1₂. Cette hypothèse s'est trouvée vérifiée en partie par des calculs stoechiométriques sur les courbes dérivatographiques, en partie après chauffage de composés contenant des nitrates alcalines en diverses quantités, par dosage de l'ammoniac et de l'azote sur le résidu. On a établi que le nouveau composé qui prend naissance se décompose à température inférieure à celle des composants individuels purs du mélange. Dans le cas d'un excès de nitrate de potassium la réaction se déroule suivant un autre mécanisme que celui correspondant à un excès de chlorure de cobalt-III hexammine.

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Vorgetragen beim Symposium für analytische Chemie in Graz, 29. September bis 1. Oktober 1965.