The kinetics of muon-catalyzed dt fusion

A main source of information about the muon-catalyzed fusion cycle in D-T mixtures are the cycling rates _c, which are characteristic for the kinetic equilibrium of states attained rapidly in dense targets. The measurement, analysis and interpretation of these rates will be discussed, concentrating on the extensive set of rates observed at PSI over the last decade in gaseous, liquid and solid targets.Invited talk presented by Peter Kammel.     

Triphenylphosphan-Nickel(0)-Komplexe mit Isocyanid-Liganden — [(RNC)nNi(PPh3)4–n] (n = 1–3)

Triphenylphosphane Nickel(0) Complexes with Isocyanide Ligands — [(RNC)_nNi(PPh₃)_4–n] (n = 1–3) Synthesis and properties of the isocyanide triphenylphosphane nickel(0) complexes [(RNC)Ni(PPh₃)₃], [(RNC)₂Ni(PPh₃)₂] and [(RNC)₃Ni(PPh₃)] (R = ^tBu, Cy, PhCH₂, p-TosCH₂) are described. I.r. and ³¹P n.m.r. spectra were recorded and the X-ray crystal structure of [(PhCH₂NC)₂Ni(PPh₃)₂] was determined.     

Mass spectrometric studies of organophosphorus compounds: III—Remarkable migration of chalcogen on electron impact of organophosphorus compounds

The mass spectra of several dibenzo (d.f)-1,3,2,-dioxaphosphorepines of the type where X=0, S, Se and R=2,2′-biphenylylene, have been studied. Dibenzochalcogen ions [RX]⁺˙ stemming directly from [M]⁺˙ were observed with high intensities, indicating specific migration of X from phosphorus to carbon with simultaneous destruction of the dioxaphosphorepine ring. Simple cleavage of P? Y as usually observed in similar organophosphorus compounds is not a common process here.     

Über die Uranylverbindungen des Natrium-cyklohexyldithiocarbaminats

Zusammenfassung Na-cyklohexyldithiocarbaminat reagiert im p_H-Bereich 6,6 bis 7,2 mit Uranylsalzen unter Bildung eines in Wasser mit gelber Farbe lösliehen Komplexes, der bei p_H 6,6 ein Absorptionsmaximum bei 392 bis 394 nm besitzt. Die wäßrige Lösung wird durch Zusatz von Alkalilauge bis zum p_H 8 bis 9 momentan entfärbt.Es wird ein Kaliumdoppelsalz KUO₂(S₂HCNC₆H₁₁)₃ · 3 H₂O beschrieben; ferner wird über die Umwandlung des Calciumdoppelsalzes beim Kochen mit NaOH berichtet.

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Summary Sodium cyolohexyldithiooarbamate reacts, in the p_H range 6.6 to 7.2, with uranium salts to yield a complex which gives a yellow aqueous solution. The absorption maximum is at 392–394 nm at p_H 6.6. The aqueous solution loses its color immediately when caustic alkali is added to raise the p_H to 8 or 9.A potassium double salt, KUO₂(S₂HCNC₆H₁₁)₃ · 3 H₂O is described. A report is also given of the transformation of the calcium double salt on boiling with NaOH.

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Résumé Le dithiocarbamate de cyclohexylsodium réagit dans le domaine de p_H 6,6 à 7,2 sur les sels d'uranyle avec formation d'un complexe coloré en jaune, soluble dans l'eau, qui possède à p_H 6,6 un maximum d'absorption pour 392–394 nm. Par addition de lessive alcaline jusqu'à p_H 8 à 9 on décolore momentanément la solution aqueuse.On décrit un sel double de potassium KUO₂(S₂HCNC₆H₁₁)₃ · 3 H₂O; on rend compte, de plus, de la transposition du sel double de calcium par chauffage avec la soude.

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Gewidmet zur 100. Wiederkehr des Geburtstages vonFriedrich Emich.     

LCAO-MO-berechnungen an schwefelhaltigen π-elektronensystemen—XXXIV : Nichtbindende S,S-wechselwirkung in polymethinfarbstoffen

Sulfur-containing polymethine dyes exhibit anomalous chromophoric properties. The vinylene shift of the first two homologues is often considerably larger or smaller than the shift between higher members of the series. Moreover, the absorption wavelengths of non-symmetrical dyes with sulfur-containing groups, as calculated by the mean value rule differ from the experimental data, but not in the predicted manner.This deviation is caused by an interannular no-bond SS-interaction in the monomethine ion. This conclusion is supported by the spectra of appropriately-substituted dyes and is substantiated by theoretical considerations. Starting from the well-known symmetry properties of polymethine MO's the simple PMO-method reproduces correctly the effects of the p_π-type overlap between atomic orbitals of adjacent S atoms at long wavelength absorptions: The SS-interactions lead to a hypsochromic shift in monomethines with (4N + 2)π-electrons (N = 1,2…) and to a bathochromic shift in monomethines with (4N)π-electrons.     

Über magnetische Beeinflussung der Polarisation der Resonanzfluoreszenz

1. Historical remarks concerning magnetic influence on the polarization of resonance fluorescence and its explanation as the Zeeman effect. 2. Rotation of the plane of polarization of the resonance fluorescence of Hg by weak magnetic fields and determination of the lifetime of the excited state. 3. Experiments concerning the excitation of the resonance fluorescence of Hg by light with different kinds and directions of polarization.