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Es wird gezeigt, daß man die langwelligen Absorptionsspektren der magnetisch normalen oktaedrischen Komplexionen mit den Übergangsmetallionen Ti3+, V3+, Cr3+, Mn3+ und Fe3+ verstehen kann, wenn man annimmt, daß die schwachen langwelligen Banden durch Übergänge zwischen den Aufspaltungsprodukten der jeweiligen Grundterme entstehen, wobei die Auf-spaltungen durch das elektrostatische Feld der Liganden zustande kommen.
This letter reports the first measurement of spin alignment, with respect to the helicity axis, for D∗+ vector mesons and their charge conjugates from charm-quark hadronisation (prompt) and from beauty-meson decays (non-prompt) in hadron collisions. The measurements were performed at midrapidity (|y|<0.8) as a function of transverse momentum (pT) in proton-proton (pp) collisions collected by ALICE at the centre-of-mass energy s√=13 TeV. The diagonal spin density matrix element ρ00 of D∗+ mesons was measured from the angular distribution of the D∗+→D0(→K−π+)π+ decay products, in the D∗+ rest frame, with respect to the D∗+ momentum direction in the pp centre of mass frame. The ρ00 value for prompt D∗+ mesons is consistent with 1/3, which implies no spin alignment. However, for non-prompt D∗+ mesons an evidence of ρ00 larger than 1/3 is found. The measured value of the spin density element is ρ00=0.455±0.022(stat.)±0.035(syst.) in the 5<pT<20 GeV/c interval, which is consistent with a PYTHIA 8 Monte Carlo simulation coupled with the EVTGEN package, which implements the helicity conservation in the decay of D∗+ meson from beauty mesons. In non-central heavy-ion collisions, the spin of the D∗+ mesons may be globally aligned with the direction of the initial angular momentum and magnetic field. Based on the results for pp collisions reported in this letter it is shown that alignment of non-prompt D∗+ mesons due to the helicity conservation coupled to the collective anisotropic expansion may mimic the signal of global spin alignment in heavy-ion collisions.
Die Lichtabsorptionseigenschaften einer Reihe von Lösungen der Komplexionen des dreiwertigen Vanadins vom Typus [V A6]3+, wo A H2O, CH3OH, C2H5OH sowie iso-C4H9OH ist, wurden gemessen. Ferner wurden die Absorptionsspektren von kristallisiertem Ammonium-sowie Caesiumvanadin(III)-alaun aufgenommen.
Intensitätsverhältnisse und spektrale Lage der in allen Spektren auftretenden langwelligen Banden stehen in guter Übereinstimmung mit den Aussagen der Theorie für den Fall eines Zentralions mit zwei d-Elektronen bei Oh-Symmetrie des Komplexfeldes.