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1974 (322)
61Author    F. F. Hanna, A. M. Bishai, M. Straßmann, W. NoerpelRequires cookie*
 Title    Dielektrische Verluste in verdünnter Lösung und innermolekulare Dipolbeweglichkeit bei Carbinolen  
 Abstract    The dielectric loss of benzyl alcohol, diphenyl-and triphenylcarbinol in dilute solutions of benzene and carbon tetrachloride is measured in the microwave range from 1 to 300 GHz. The ab­ sorption curves can be separated into three regions, the one with the longest relaxation time is due to the overall rotation of the molecule. In both the carbinols the OH-group is hindered in its rota­ tion and partly it reorients with time constants which we suggest being due to the rotation of the phenyl ring. For the fast angular oscillations (libration) of the OH-group itself time constants between 0.15 and 3 ps are extrapolated. D ie OH-Gruppe zeichnet sich durch eine besonders schnelle innermolekulare Beweglichkeit aus, die sich im Auftreten sehr kurzer Relaxationszeiten der D i­ polorientierung meist unter 1 ps bemerkbar macht. D arauf wurde zuerst aus der relativ geringen A b ­ sorption der A lkohole in verdünnter Lösung bei m-W ellen geschlossen *, während später M ikrow ellen­ messungen weitere Einzelheiten der Relaxationszeit-verteilung erkennen ließen, die mit dem Anstieg der erreichbaren Meßfrequenzen detaillierter wurden 2 4. In Phenolen w ird gegenüber aliphatischen A lk o ­ holen eine Verringerung der schnell beweglichen Momentkomponente durch mesomere W echselwir­ kung mit dem rr-Elektronensystem des Ringes beob­ achtet 2' 5; 6. Bei Benzylalkohol mit der OH-Gruppe an einem aliphatischen C-Atom ist das erwartungs­ gemäß nicht der F a ll3. Uns sind aber keine V e r­ suche bekannt, die Beweglichkeit der OH-Gruppe in M olekeln zu verfolgen, in denen weitere W asserstoff­ atome der Methylgruppe sukzessive durch Phenyl­ gruppen ersetzt sind. Uber derartige Untersuchungen soll zusammen mit neuen Messungen an Benzyl­ alkohol herab bis 1 mm W ellenlänge berichtet w er­ den. E x p e rim e n te lle s Gemessen w ird die Absorptionsgröße e" in ver­ dünnter Lösung von Benzol oder Tetrachlorkohlen 
  Reference    (Z. Naturforsch. 29a, 440 [1974]; eingegangen am 26. Oktober 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0440.pdf 
 Identifier    ZNA-1974-29a-0440 
 Volume    29 
62Author    W. KesselRequires cookie*
 Title    On a General Formula for the Transition Temperature of Superconductors  
 Abstract    A method of solution of the Eliashberg equations in the theory of superconductivity is derived which uses the fact that near the transition point the energy gap is small compared to the energies over which the electron-phonon properties vary appreciably. On this basis the Eliashberg equations are converted into linear inhomogeneous integral equations. Their solution is given in operator form and provides a general formula for the transition temperature. 
  Reference    (Z. Naturforsch. 29a, 445 [1974]; received 24 December 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0445.pdf 
 Identifier    ZNA-1974-29a-0445 
 Volume    29 
63Author    J. K. Kawski, Am IńskiRequires cookie*
 Title    A Energy Transfer Among Like and Unlike Molekules in Solution  
 Abstract    A theory presenting uniform description of the excitation energy transfer among like (concentra­ tion depolarization of photoluminescence) and unlike (quenching by foreign absorbing substances) molecules in solutions is given. Based on the shell model of a luminescent centre, expressions for the emission anisotropy as well as the quantum yield of photoluminescence have been obtained. The dependence of the probability of resonance excitation energy transfer on the mutual orientation of the transition moments of the interacting sensitizer and acceptor molecules, as well as the fluctuations of the concentration of the acceptor molecules have been taken into account. Der Nachweis der zwischenmolekularen Energie­ wanderung in Fluoreszenzlösungen kann zwischen gleichartigen Molekülen durch die Konzentrations­ depolarisation der Fluoreszenz, zwischen ungleich­ artigen durch die Fluoreszenzlöschung und sensibili­ sierte Fluoreszenz geführt werden. Der Mechanismus des strahlungslosen Energieübergangs über größere Molekülabstände in Lösungen wurde von vielen Autoren behandelt1-4. Nach diesen Theorien kann die Elektronenanregungsenergie auch ohne Em is­ sions* und Absorptionsprozesse von einem Molekül zum anderen über Entfernungen bis etwa 100 Ä ge­ langen, wenn sich die Fluoreszenzbande und eine intensive langwellige Absorptionsbande der b eteilig­ ten Moleküle hinreichend stark überlappen. Die Wahrscheinlichkeit (pro sec) oder Geschwindigkeits­ konstante des EnergieÜbergangsprozesses ist nach Förster 3: 1 (R « i r \\ = (1) H ier ist Tj, die tatsächliche mittlere Lebensdauer des angeregten Donormoleküls in Abwesenheit eines A k ­ zeptors. Sie hängt mit Tp° (natürliche Lebensdauer des angeregten D onors) und der Quantenausbeute rjD° der Donorfluoreszenz (ohne Energieübertra­ gung) in folgender W eise zusammen: td = *?d0 ' t d ° -(2) R0 ist der kritische Molekülabstand, bei welchem Energieübergang und spontane Desaktivierung des 
  Reference    (Z. Naturforsch. 29a, 452 [1974]; eingegangen am 29. Oktober 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0452.pdf 
 Identifier    ZNA-1974-29a-0452 
 Volume    29 
64Author    H. M. ArkertRequires cookie*
 Title    Vaulting and Displacement of Pole-Covered 180°-Domain Walls  
 Abstract    A zero approximation has been given of the normalized vaulting amplitudes of 180°-domain walls which are assumed to be vaulted between repulsive interaction lines if equilibrium has taken place between an external magnetic field and the counteracting forces resulting from the stray fields of the vaulting-induced free magnetic surface poles. Calculations have been carried out for two cases: cylindrical vaulting between linear barrier lines and pillow-shaped vaulting between isolated interaction points building up a tridimensional lattice of hindering points. 
  Reference    (Z. Naturforsch. 29a, 457 [1974]; received 1 April 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0457.pdf 
 Identifier    ZNA-1974-29a-0457 
 Volume    29 
65Author    N. C. HaiderRequires cookie*
 Title    Optical Absorptions in Metal Sodium: The Temperature Dependence in the Liquid State  
 Abstract    The temperature dependence of optical absorptions in liquid Na is calculated. The electron energy values are obtained to second order in perturbation theory which are then used to determine the electron density of states. The density of states plots show some structure similar to those noted in the solid state. The optical conductivity in the liquid state is found to increase with the tem­ perature as in the solid state. The present calculation for the optical conductivity gives a rather sharp peak around hco = 1.7 eV. These results are in better agreement with the existing experi­ mental results. 1. In tro d u c tio n The study o f optical properties o f alkali metals 1,2 is o f substantial theoretical and experimental inter­ est. This is because, in one hand, the alkali metals are good candidates fo r nearly free electron system, on the other hand, they exhibit experim entally some strong absorption in the intermediate region l < f o c o < 2 eV follow ed by marked interband tran­ sitions above the interband threshold 7 iC O > 2 eV . This is somewhat unusual, because the results ob­ tained fo r other liquid metals thus far agree gener­ ally with the Drude theory which is based purely on the free electron model. Furthermore, most liquid metals do not show any absorption edges except in the far ultraviolet region where excitation o f the core electron becomes possible. It might be pointed out, however, that the density o f states o f liquid metals are not necessarily free electron-like. The experimental work o f M ayer and H ie te l2 showed that the optical absorptions in liquid N a has two sharp peaks, one relatively strong peak at h.a> = 1 .6 5 e V and the other interband transition peak at h co = 3.2 eV. This result is rather new and important, since the metals upon m elting are ex­ pected to lose their periodic lattice, and the concept o f the Bloch theorem and sharp B rillouin zone boundaries have no v a lid ity 3; this should be espe­ cially true for simple metals 4. Although experim en­ tally it is extremely d iffic u lt5 to measure any optical absorptions in such a low energy region, the occur­ rence o f the above peak might be real, if some o f the solid state characteristics are retained in the liquid 
  Reference    (Z. Naturforsch. 29a, 462 [1974]; received 10 December 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0462.pdf 
 Identifier    ZNA-1974-29a-0462 
 Volume    29 
66Author    SilasE. Gustafsson, H.E Gunilla Knape, LenaM T OrellRequires cookie*
 Title    Determination of the Hypersonic Velocities in the Molten Salts N aN O s and K N O s  
 Abstract    Hypersonic velocities in the molten salts NaNOs and K N 0 3 have been obtained by Brillouin scattering measurements. A He-Cd laser, 4416 A, was used as a radiation source and the scattered light was analyzed with a pressure-scanned Fabry-Perot spectrometer. The temperature dependence of the sound velocity was determined in a temperature range covering some 1 0 0 ° above the melting point of the investigated salts. The obtained hypersonic velocity for N aN 0 3 was about the same and for K N 0 3 greater than reported ultrasonic velocities indicating that the measurements are performed in a frequency region below any possible relaxation frequency for NaNO-> and above some possible relaxation frequencies for K N 0 3 . In tro d u c tio n B rillouin spectroscopy has long been used when studying acoustic properties o f thermal waves in liquids in the hypersonic region. In this laboratory B rillouin scattering measurements have been per­ form ed previously in several liquids at room tem­ perature 2 and at present in molten salts at high temperatures. A comparison o f the measured hypersonic velocity data with ultrasonic data provides evidence fo r some properties o f the liquids such as relaxation processes. In pure liquids two types o f relaxation phenomena are known to produce velocity dispersion 3' 4: ther­ mal and structural relaxation. Thermal relaxation is due to the exchange o f external and internal degrees o f freedom , that is, an irreversible exchange of energy between the translational and vibrational or (and) rotational degrees o f freedom. The structural relaxation is due to slow structural changes caused by the passage o f the sound wave which disturbes the equilibrium degree o f order. The disturbed system is restored to equilibrium but a delay in this equali­ zation leads to dispersion in the sound velocity. In nonassociated liquids the thermal relaxation processes are dominant whereas structural relaxation predominates in associated liquids. The present paper reports on molten alkali nitrates which may be expected to behave like associated liquids because o f the strong attractive Coulomb interaction between the positively and negatively charged ions in the salts. In these investigations the hypersonic velocities o f molten N a N 0 3 and K N 0 3 and their temperature dependence have been measured and compared with earlier ultrasonic data obtained by H iggs and Lito-vitz ° and by Bockris and Richards 6. K N 0 3 has not previously been investigated in the hypersonic fre ­ quency region, whereas measurements on N a N 0 3 have recently been perform ed by Reinsborough and Valleau '. E x p e rim e n ta l 
  Reference    (Z. Naturforsch. 29a, 469 [1974]; received 26 November 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0469.pdf 
 Identifier    ZNA-1974-29a-0469 
 Volume    29 
67Author    J. D. Marcoll, P. C. Schmidt, Alarich WeissRequires cookie*
 Title    X-Ray Investigations of the Intermetallic Phases C aC d ^ T l, and Caln^Tl^and Knight Shift Measurements of 205T1-and 113Cd-NMR in the System CaCd^Tl^  
 Abstract    The quasibinary systems C aC d i-zT lz and C aln i-aT l* form continuous series of solid solutions for all concentrations x: 0 x <! 1. All alloys of both systems crystallize with space group Oh1-Pm3m and one formula unit per unit cell (CsCl-type structure). Considerable deviations from Vegard's law occur for CaCdi _ ^Tl^ , while they are negligible for Calni _ rTlx ■ No sign for the appearance of superstructures was found in either system after equilibrating them at 300 °C for two hours. In the system CaCdi-a/Tlr the Knight shift K s of the 205T1-and u 3Cd-NMR was measured at room temperature as a function of x. Saturated T1(CH3C 02)-and C d (N 03) 2 solutions served as reference samples. The Knight shift of the 205Tl-resonance increases remarkably with increasing concentration x, whereas the Knight shift of the 113Cd-NMR decreases slightly with increasing x. No simple qualitative explanation i: 
  Reference    (Z. Naturforsch. 29a, 473 [1974]; received 20 December 1973) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0473 
 Volume    29 
68Author    P. C. Schmidt, Alarich WeissRequires cookie*
 Title    Band Structure of CaCd and CaTl and the Knight Shift of 113Cd-and 205T1-NMR in the System CaCdj.* Tlx  
 Abstract    The energy bands of ordered CaCd and CaTl have been calculated by the nonrelativistic aug­ mented plane wave (APW) method. The electron structure in the system CaCdi_zTl.r is deduced from these calculations by using the rigid band model for the phases with O 'C z^ l. The band structures of CaCd and CaTl are similar to the valence bands of other phases of the CsCl-type. From the energy eigenvalues the electronic density of states curve, the partial densities of states curves, and the Fermi energy have been obtained. For states near the Fermi surface the spin density at the position of the Cd-and Tl-nuclei has been determined. The Knight shift K s of the 113Cd-NMR and the 205T1-NMR in the system CaCdi-^Tlx has been calculated as a function of x. The slope of the curve K s (x) for the Cd-NMR is equal for experi­ mental and theoretical results. The absolute value of the calculated Knight shift is about a factor of 1.4 too small. Only the direct term to the Knight shift has been calculated. Relativistic effects have been included by a scale factor. It has not been possible to explain the shape of the function (2) for the Tl-NMR, since a full relativistic APW calculation is necessary for CaTl. 
  Reference    (Z. Naturforsch. 29a, 477 [1974]; received 20 December 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0477.pdf 
 Identifier    ZNA-1974-29a-0477 
 Volume    29 
69Author    D. E. Sinclair, 0. K. ManuelRequires cookie*
 Title    Argon-36 from Neutron Capture on Chlorine in Nature  
 Abstract    Argon analysis on samples of sodalite from Dungannon, Ontario reveals an excess of 36Ar from neutron capture on 35C1 and excess 40Ar from the decay of 40K. These results indicate an average production rate of 5.6 X 102 atoms of 3®C1 per year per gram of chlorine over the age of the mineral. 3 .9 X 1 0 8 yrs. The surface residence time of chlorine-rich rocks may be determined from the amounts of 36Ar which accumulate during the time period of exposure to cosmic rays. 
  Reference    (Z. Naturforsch. 29a, 488 [1974]; received 13 November 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0488.pdf 
 Identifier    ZNA-1974-29a-0488 
 Volume    29 
70Author    Peter Potzinger, LouisC. Glasgow, Bruno ReimannRequires cookie*
 Title    Arrhenius-Parameter und kinetischer Isotopeneffekt für die Reaktion von Wasserstoffatomen mit Silan  
 Abstract    The Relative rate constants were measured for the systems H + C2H4/SiD 4 and D + C2D4/SiH 4 over a wide temperature range. From the known arrheniusparameter for the reaction H + C2H4 the activa­ tion energy Ea and the preexponential factor A of the abstraction reaction H + SiD4 -> H D + SiD3 may be calculated. Values of Ea = 3.2 kcal/Mol and A = 4 .9 2 • 1013 cm3 M ol-1 sec-1 were obtained. Upper limits for the kinetic isotope effects are given in the paper. 
  Reference    (Z. Naturforsch. 29a, 493—496 [1974]; eingegangen am 12. Dezember 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0493.pdf 
 Identifier    ZNA-1974-29a-0493 
 Volume    29 
71Author    Stefania Zuca, Mariela ConstantinescuRequires cookie*
 Title    Self-Diffusion Coefficients in the Molten A g N 0 3-A lk N 0 3 Systems  
 Abstract    The cationic self-diffusion coefficients in the fused (Ag-Li) N 0 3 , (Ag-Rb) N 0 3 and (Ag-Cs) N 0 3 systems have been investigated as a function of composition and temperature. The deviation from linearity of the D+ vs. composition isotherms in the (A g-A lk)N 03 series is discussed in terms of ionic interactions. Quantitative relationships between D + and ionic size and mass have been established. 
  Reference    (Z. Naturforsch. 29a, 497 [1974]; received 14 August 1973) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0497.pdf 
 Identifier    ZNA-1974-29a-0497 
 Volume    29 
72Author    Giorgio Flor, VincenzoM. Assarotti, Riccardo RiccardiRequires cookie*
 Title    Kinetics of Formation of S rW 04 in the Solid State Reaction Between W 0 3 and SrC 03  
 Abstract    The solid state reaction W 03+ S r C 0 3 SrW 04+ C 0 2 was studied with the reactants in form both of separate pellets and of powder mixtures. As for pellets, by an application of Wagner's method it was possible to state that the governing process is the cation counterdiffusion involving W6+ and Sr2*. Thermogravimetric measurements in the temperature range 663° — 755 °C on equimolar powder mixtures and with SrC03 in a specially prepared Wagner's equation. 
  Reference    (Z. Naturforsch. 29a, 503—506 [1974]; received 17 January 1974) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0503 
 Volume    29 
73Author    T. Keough, J. H. Beynon, R. G. Cooks, C. Chang, R. H. ShapiroRequires cookie*
 Title    Metastable Ions as a Guide to Reaction Mechanisms. Loss of 'O H from Substituted Nitrobenzene Molecular Ions  
 Abstract    Loss of OH from the molecular ions of nitrobenzenes having various substituents in the m-and p-positions does not involve substituent randomization and reaction through the ortho-isomer; the kinetic energy release accompanying metastable ion fragmentation shows this latter to be an entirely distinct process. The origin of the hydrogen lost as 'OH in the m-and p-compounds is the ring (mainly the position ortho to the nitro group in methyl p-nitrobenzoate). However, the hydro­ gens of the substituent do play a direct role in the reaction as shown by an isotope effect upon the abundances of metastable peaks. Hydrogen atom abstraction by the ionized nitro group apparently occurs independently of participation by the substituent on the nitrobenzene but a second hydrogen transfer frorr this substituent to the ring precedes fragmentation. Direct interaction between groups o ', the aromatic ring that are not ortho to each other therefore apparently does not occur. Inversion of the rate constants for two reactions, NO' loss and CH20 loss from the methyl p-nitrobenzoate molecular ion in the metastable ion time range, 
  Reference    (Z. Naturforsch. 29a, 507 [1974]; received 5 November 1973) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0507 
 Volume    29 
74Author    Marwan Dakkouri, Heinz OberhammerRequires cookie*
 Title    T rimethy lsilylcy anid Strukturbestim m ung mit Hilfe der Methode der Elektronenbeugung an Gasen  
 Abstract    The gas-phase molecular structure of (CH3) 3SiCN was determined by means of electron dif­ fraction. The structural parameters are found to be: ra (Si —C =) -1 .844± 0.022 A, ra (C = N) = 1.170±0.007 A, ra (S i -C m) = 1.871 ± 0 .0 0 8 A, ra (C -H) = 1.111 ± 0 ,0 0 9 A, (<£C m-S i —C =)= 107.0° ± 1 .5 ° and (<£ S i -C -H) = 110.4° ± 1.5°. The mole fraction of Isocyanide at 45 °C nozzle temperature was estimated to be smaller than 2%. 
  Reference    (Z. Naturforsch. 29a, 513 [1974]; eingegangen am 14. Dezember 1973) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0513 
 Volume    29 
75Author    K. M. SrivastavaRequires cookie*
 Title    Rayleigh-Taylor Instability of a Stratified Plasma  
 Abstract    We have investigated the effect of finite Larmor radius on the Rayleigh-Taylor instability of a semi-infinite, compressible, stratified and infinitely conducting plasma. The plasma is assumed to have a one dimensional density and magnetic field gradients. The eigenvalue problem has been solved under Boussinesq approximation for disturbances parallel to the magnetic field. It has been established that for perturbation parallel to the magnetic field, the system is stable for both stable and unstable stratification. For perturbation perpendicular to the magnetic field, the problem has been solved without Boussinesq approximation. The dispersion relation has been discussed in the two limiting cases, the short and long wave disturbances. It has been observed that the gyroviscosity has a destabilizing influence from k = 0 to k = 4.5 for ß* = 0.1 and for ß* = 0.1 up to k* = 2.85 and then onwards it acts as a stabilizing agent. It has a damping effect on the short wave distur­ bances. For some parameters, the largets imaginary part has been shown in Figs. 1 and 2. 1. In tro d u c tio n 
  Reference    (Z. Naturforsch. 29a, 518 [1974]; received 6 October 1973) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0518 
 Volume    29 
76Author    P. Deimel, A. W. Aas, H. DanielRequires cookie*
 Title    Barkhausen-Spektren von Eisen bei 300 K und 77 K  
 Abstract    Barkhausen Spectra of Iron at 300 K and 77 K Barkhausen spectra of iron have been measured at 300 K and 77 K. At the lower temperature less Barkhausen jumps were registrated. The large jumps disappeared almost completely. The dependence of the Barkhausen spectra on the slope of the hysteresis curve was also measured. 
  Reference    (Z. Naturforsch. 29a, 524 [1974]; eingegangen am 12. Dezember 1973) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0524 
 Volume    29 
77Author    D. Pumpern, A. AžmanRequires cookie*
 Title    NM R Spectrum o f Oriented 2-chloroethanol  
 Abstract    Various spectroscopic methods predict that an intram olecular hydrogen b o n d in g 1 is operating in 2-chloroethanol. The aim of this work is to report the NMR spectrum of oriented 2-chloroethanol (Figure 1). The nematic phase Merck V was used Cl M % / / X H, Ha Fig. 1. Scheme of 2-chloroethanol. 
  Reference    (Z. Naturforsch. 29a, 527 [1974]; received 10 January 1974) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0527_n 
 Volume    29 
78Author    OskarE. PolanskyRequires cookie*
 Title    Charakterordnungen angeregter Zustände 2  
 Abstract    In spite of the complete neglect of spins in HMO theory different character orders are obtained for the lowest excited singlet and triplet states. Since 3ol* > 1ol*, possibly the typical reaction paths of tripletts are mainly determined by electronic factors. 
  Reference    (Z. Naturforsch. 29a, 529 [1974]; eingegangen am 12. Dezember 1973) 
  Published    1974 
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 Identifier    ZNA-1974-29a-0529_n 
 Volume    29 
79Author    F. DäublinRequires cookie*
 Title    D issoziative Ionisation von M olekülen durch Alpha-Teilchen-und Elektronenstoß hei gleichen Stoßteilchen-Geschwindigkeiten Dissociative Ionization of Molecules by Impact of a-Particles and Electrons at the same Velocities  
 Abstract    The mass spectra of CH4 , C2H6 , C3H8 and C2H4 pro­ duced by bombardment with a-particles and electrons show near agreement. This is approximately in accordance with the theoretical expectations. In contrast to the observations made by Melton and Rudolph, no essential stabilization by collision of excited ions was established. 
  Reference    (Z. Naturforsch. 29a, 531 [1974]; eingegangen am 16. Januar 1974) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0531_n.pdf 
 Identifier    ZNA-1974-29a-0531_n 
 Volume    29 
80Author    J. Haase, P. W. IdmannRequires cookie*
 Title    K ristallstruktur und K onstitution des Perchlorcyclooctatetraens (y-C8Cl8)  
 Abstract    The crystal structure of perchlorocyclooctatetraene (y-C8Cl8) has been investigated and solved by direct meth­ ods. As a result of the cry stal structure analysis the constitu­ tion of the molecule, derived by Helm, Roedig, Smith and West from spectroscopic measurements, has been found to be true. 
  Reference    (Z. Naturforsch. 29a, 533 [1974]; eingegangen am 2. Februar 1974) 
  Published    1974 
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 TEI-XML for    default:Reihe_A/29/ZNA-1974-29a-0533_n.pdf 
 Identifier    ZNA-1974-29a-0533_n 
 Volume    29 
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