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1973 (262)
1Author    G. LehmpfuhlRequires cookie*
 Title    Electron and Positron Density Distribution of Bloch Waves  
 Abstract    The charge density distribution in the strongest Bloch waves for a dynamical many-beam diffraction situation was calculated for electrons and positrons. Near the [110] zone axis of MgO there exist three strong Bloch waves for electrons. One Bloch wave is concentrated at ihe rows of Mg-atoms, a second at the rows of O-atoms and a third one between the atoms. The positron Bloch waves are mainly concentrated between the atom rows and have only small charge density at the positions of the atoms. For an incident beam parallel to the [110] axis there exists only one strong positron Bloch wave while for electrons more than three Bloch waves are strong, ex­ plaining the channeling behaviour of positrons and electrons. Strong partial waves of different electron Bloch waves can be identified in the diffraction pattern from a MgO crystal wedge. 
  Reference    (Z. Naturforsch. 28a, 1 [1973]; received 24 October 1972) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0001.pdf 
 Identifier    ZNA-1973-28a-0001 
 Volume    28 
2Author    K. H. PasslerRequires cookie*
 Title    Ml Transitions in the Reaction 6Li(r,2H)4He  
 Abstract    It is shown that the admixture of a D-state in the wave function for the relative motion of the s-particle and the deuteron in the nucleus 6Li leads to Ml transitions. Their mixture with E2 transitions does not lead to an asymmetry of the differential cross section of the reaction cLi(y,2H)4He about 90°, and they are negligibly small. 
  Reference    (Z. Naturforsch. 28a, 8 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0008.pdf 
 Identifier    ZNA-1973-28a-0008 
 Volume    28 
3Author    Requires cookie*
 Title    DREIDIMENSIONALE HOMOGENE WELLENGLEICHUNG  
 Abstract    11 In Fig. 3 the total cross section of the Ml transitions is shown which was obtained with the value b = 0.024. The potential used in these calculations was chosen to give the correct phase shifts of the 4He(2H, 2H)4He scattering between 2 and 10 MeV and to reproduce the resonance of the shift at 1.07 MeV. This cross section is considerably smaller than that for El and E2 transitions 2 and thus it can be neglected. The rea­ sons for its smallness are 1) the smallness of the D-state probability in the nucleus 6Li and 2) an isospin selection rule 5 which diminishes the probability for Ml transitions with AT = 0 in self-conjugate nuclei by a factor of about 100. In the calculations of Mamasakhlisov and Macha-radze 2 a square well potential with a well radius of 3.5 fm is used for the relative motiton. The depth is dependent on the angular momentum of the system 4He + • 2H; for the S-state it is 32.34 MeV. This poten­ tial is considerably different from the potential used in the present calculations and shown for the S-state in Fig. 1. The effect of the use of this long range po­ tential with a repulsive hard core is mainly to increase those radial matrix elements which contain a power of 5 G. Morpurgo, Phys. Rev. 110, 721 [1958]. 
  Reference    (Z. Naturforsch. 28a, 11 [1973]) 
  Published    1973 
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 Identifier    ZNA-1973-28a-0011 
 Volume    28 
4Author    Requires cookie*
 Title      
  Reference    (Z. Naturforsch. 28a, 14 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0014.pdf 
 Identifier    ZNA-1973-28a-0014 
 Volume    28 
5Author    Requires cookie*
 Title    suiting  
 Abstract    inequality once more with the aid of the rela-course, (6) has to be used also. The proof of (54) was tion log (1 + x) < x,one obtains inequality (54). Of just the aim of this section. 
  Reference    (Z. Naturforsch. 28a, 22 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0022.pdf 
 Identifier    ZNA-1973-28a-0022 
 Volume    28 
6Author    Ch En, Leich ErRequires cookie*
 Title    DAS LASERERREGTE RAMAN-SPEKTRUM VON GASFÖRMIGEM FLUOR  
 Abstract    27 D a s la s e re rre g te R a m a n -S p e k tru m v o n g a s fö rm ig e m F lu o r W. S tric k e r The laser excited Raman spectrum of gaseous fluorine The pure rotational and the rotation-vibrational Raman spectrum of gaseous F2 at a pressure of 2 atm were photoelectrical^ recorded. The vibrational transitions 0— »1, 1-^2 and 0— were observed. The analysis of the spectra yields the molecular constants JGj/j = (893,5 ± 1,5) cm"1, cue*e = OM ± 1) cm"1, B0 = (0,8847 ± 0,0010) cm"1, = (0,872 ± 0,002) cm"1. D0 = (0,49 ± 0,10) • IO'5 cm"1, 
  Reference    (Z. Naturforsch. 28a, 27 [1973]; eingegangen am 27. Oktober 1972) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0027.pdf 
 Identifier    ZNA-1973-28a-0027 
 Volume    28 
7Author    Requires cookie*
 Title    Die  
 Abstract    Analyse des reinen Rotationsspektrums von F2 ergibt für die Rotationskonstanten B0 und D0 Werte, die in ausgezeichneter Übereinstimmung mit den Er­ gebnissen von Edwards und Mitarbeitern 4 sind. Die in unserer Arbeit erreichte, etwas geringere Genauig­ keit gegenüber der photographischen Registrierung ist durch die photoelektrische Meßmethode und vor allem durch die geringere Brennweite des Doppelmonochro-mators bedingt. Die Auswertung des Rotationssdhwin-gungsspektrums bezüglich JG t/, führt zu einer gerin­ gen Diskrepanz gegenüber den veröffentlichten Wer­ ten, die nicht völlig geklärt ist. In unserem Fall wird der Peak des Q-Zweiges der Grundschwingungsbande gemessen. Photographisch registrierte Spektren bezie­ hen sich auf Kantenmessungen. Eine Berücksichtigung der Kante würde aber hier die Abweichung noch ver­ 
  Reference    (Z. Naturforsch. 28a, 30 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0030.pdf 
 Identifier    ZNA-1973-28a-0030 
 Volume    28 
8Author    Requires cookie*
 Title      
 Abstract    Z u r F o rm u lie ru n g d e r H y p o th e s e v o n d e r e la stisc h en F o rm ä n d e ru n g se n e rg ie d ic h te m it e in e r E rw e ite ru n g a u f d e n e la stisc h -p la stisc h e n B ereich J. B etten 
  Reference    (Z. Naturforsch. 28a, 35 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0035.pdf 
 Identifier    ZNA-1973-28a-0035 
 Volume    28 
9Author    Requires cookie*
 Title    Die  
 Abstract    Werkstoffanstrengung im elastisch-plastischen Bereich kann beschrieben werden, indem man in den Lösungen (10) und (15) die elastische Querzahl v durch die elastisch-plastische Querzahl vep gemäß Gl. (22) ersetzt. Die Ergebnisse lauten dann: 
  Reference    (Z. Naturforsch. 28a, 37 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0037.pdf 
 Identifier    ZNA-1973-28a-0037 
 Volume    28 
10Author    S. PizziniRequires cookie*
 Title    Acknowledgements are due to Prof  
 Abstract    for encouraging discussions. 
  Reference    (Z. Naturforsch. 28a, 45 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0045.pdf 
 Identifier    ZNA-1973-28a-0045 
 Volume    28 
11Author    Requires cookie*
 Title    S e lf  
 Abstract    D iffu s io n C o e ffic ie n ts in M o lte n A g N C b -N a N C h a n d A g N C h -K N C h M ix tu re s 
  Reference    (Z. Naturforsch. 28a, 51 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0051.pdf 
 Identifier    ZNA-1973-28a-0051 
 Volume    28 
12Author    Requires cookie*
 Title      
 Abstract    Fig. 4. Dependence of the self-diffusion coefficient of Ag+ on the (rt—rt) difference. 
  Reference    (Z. Naturforsch. 28a, 54 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0054.pdf 
 Identifier    ZNA-1973-28a-0054 
 Volume    28 
13Author    M.V C Sastri, U. H. Srikant, J. Sei, Ind, ResRequires cookie*
 Title      
 Abstract    , größeren Adsorptions wärmen zu verstehen, wäre danach eine Zunahme der Adsorptionsvolumina ge­ genüber reinem Wasserstoff zu fordern, nämlich um jenen Anteil, der die Wärmeentwicklung bewirken soll. Die Isothermen in Abb. 2 widersprechen dem jedoch. Es ist deshalb zu folgern, daß der Wärmeeffekt nicht durch eine zusätzliche Adsorption, sondern durch eine Wechselwirkung der adsorbierten Spezies an der Ka­ talysatorenoberfläche hervorgerufen wird, etwa durch Bildungsenthalpien von Oberflächenkomplexen oder definierten Oberflächenstrukturen. Das Auftreten von Sorptionskomplexen kann somit auch aus energetischen Messungen gefolgert werden und steht im Einklang mit den in der Einleitung zi­ tierten, durch andere Meßmethoden ermittelten Resul­ taten. 13 M. V. C. Sastri u. H. Srikant, Curr. Sei. 20, 15 [1951]. Betrachtet man abschließend den Einfluß der Zu­ sammensetzung des zur Adsorption angebotenen Gas­ gemisches auf die Sorptionswärmen, so ist mit steigen­ dem N2Anteil eine Wärmezunahme festzustellen. Audi dieses Ergebnis wird durch Adsorptionsmes­ sungen von Sastri und Srikant 13_ 14 bestätigt, die mit zunehmendem N2-Partialdruck eine wachsende Komplexbildung postulieren. Der Deutschen Forschungsgemeinschaft danken wir für die finanzielle Unterstützung, Herrn Dr. Gerhard Schulz von der BASF für die Bereitstellung des Ka­ talysators, Herrn Dipl.-Ing. H. Roberg sei für zahl­ reiche apparative Winweise und Herrn Dr. G. Schulz-Ekloff (Robert Bosch GmbH) für die kritische Dis­ kussion gedankt.. 20D, 321 [1961]. O n th e m e a n in g o f tim e -re v e rs a l in v a ria n c e v io la tio n P. du T. van d e r m erw e Atomic Energy Board, The possible effect of a cosmological background (such as proton~neutron preponderance) on the meaning of time"reversal violation is discussed in the context of the Diirr~Heisenberg degenerate vacuum theory of strangeness. 
  Reference    (Z. Naturforsch. 28a, 57 [1973]; received 3 October 1972) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0057.pdf 
 Identifier    ZNA-1973-28a-0057 
 Volume    28 
14Author    F. Okuyama, Ö. Llg, N., H. D. BeckeyRequires cookie*
 Title      
 Abstract    The dependence of the field ionization behaviour of olefines on field-induced surface reactions is demonstrated using 1-Hexene as an example. Different emitter-and field strength dependent reaction mechanisms leading to the production of (M+l)+ and (M-l)+ ions may be distinguished. The characteristics of define spectra taken using activated emitters are determined largely by surface induced reactions which appear at higher field strengths. These have as their starting point an ionic field adsorption of the olefine. In particular the field enhancement of the organic microneedles is strongly influenced by field adsorbed ions so that field dissociation products are also measured with increased intensity. 
  Reference    (Z. Naturforsch. 28a, 60 [1973]; eingegangen am 18. November 1972) 
  Published    1973 
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 Identifier    ZNA-1973-28a-0060 
 Volume    28 
15Author    H.C WRequires cookie*
 Title     
 Abstract    e w e g u n g e n d e r C H 3 -G ru p p e n in M e th y l-N a p h ta lin -K r is ta lle n III. Protonenspin-Relaxation bei tiefen Temperaturen J. U. von S chütz *, W. G ü t t le r In continuation of earlier works (temperature range 400 — 77 K) the temperature and frequency dependencies of the longitudinal relaxation time Tt in different methyl naphthalene crystals were measured down to 4,2 K at 22 and 56 MHz. The observation of two minima in some cases below 50 K could be attributed quantitatively to the weakly hindered ß-CH3 groups (£a <0,8 kcal/mole) by comparison of the results of similar methyl naphthalenes. The low relaxation rate in the minima is due to tunneling effects of the methyl groups. The splitting of the lowest torsional niveau could be roughly determined. 
  Reference    (Z. Naturforsch. 28a, 69 [1973]; eingegangen am 19. November 1972) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0069.pdf 
 Identifier    ZNA-1973-28a-0069 
 Volume    28 
16Author    F. Scappini, H. M. Äder, J. SheridanRequires cookie*
 Title     
 Abstract    n v e s tig a tio n o f th e In te r n a l R o ta tio n in P ro p a rg y l M e rc a p ta n b y M ic ro w a v e S p e c tru m A n a ly s is The microwave investigation of propargyl mercaptan has been continued to study the internal rotation of the SH group in the molecule. A Hamiltonian is proposed to describe the over-all rotation and the torsion of the top. The analysis leads to the result that the potential function is a double minimum potential with a lower barrier of 470 ± 10 cm-1 at the eis position and a higher barrier of 2000 ± 500 cm-1 at the trans position. 
  Reference    (Z. Naturforsch. 28a, 77 [1973]; received 2 December 1972) 
  Published    1973 
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 Identifier    ZNA-1973-28a-0077 
 Volume    28 
17Author    JaakkoK E Lo Ra, N. TaRequires cookie*
 Title      
 Abstract    tra m o le c u la r D ip o le R e o r ie n ta tio n o f A m in o C o m p o u n d s a n d th e ir I n te r a c tio n w ith S o lv e n t M o le c u les II The dielectric absorption of dilute solutions of chlorocyclohexane, cyclohexylamine, dicyclo-hexylamine, diphenylamine, N-methyldiphenylamine, and triphenylamine in various solvents has been measured between 0.3 and 135 GHz. The measurements have been carried out at 20 °C and for some solutions also at -30 and 60 °C. The previous measurements made for the compounds have been extended to higher frequencies and improved by a greater number of frequencies. The loss curves have been resolved into multiple absorption regions. A rather much contributing far infrared (FIR) term was necessary to be involved in each analysis. The intra­ molecular dipole reorientation process in cyclohexylamine is considerably slower than in aniline because of the lack of the mesomeric interaction. In dicyclohexylamine only the overall re­ laxation was observed at microwave frequencies. Two large regions were resolved for N-methyl­ diphenylamine at microwave frequencies whilst in diphenylamine the second region likely contributes to the very large FIR region. Evidences for weak association between diphenyl­ amine and the aromatic solvents were obtained. 
  Reference    (Z. Naturforsch. 28a, 82 [1973]; received 28 November 1972) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0082.pdf 
 Identifier    ZNA-1973-28a-0082 
 Volume    28 
18Author    H. J. Schenk, K. SchwRequires cookie*
 Title     
 Abstract    o la ris ie rte A b s o r p tio n s s p e k tr e n v o n T e c h n e tiu m (IV) u n d R h e n iu m (IV) in trig o n a le n H e x a h a lo g e n o s ta n n a t(I V) -E in k r is ta lle n bei tie fe r T e m p e r a tu r Polarized low temperature absorption spectra of technetium(IV) and rhenium(IV) in trigonal single crystals of hexahalogenostannates(IV) Polarized absorption spectra of technetium(IV) and rhenium(IV) in trigonal single crystals of (C2H5NHs)2 [SnCl6] and (C2H5NHj)2[SnBr,] have been measured in the range of 8000 to 2800 A at 298 and 77 °K. The crystal point group is Dsd and the metal ions occupy sites of D3d-symmetry too. The observed excited levels arise from both 7i**&3 and 7t23d4 configurations; the different temperature and polarisation dependence of d — d intra-shell and n -* • d metal reduction transitions is discussed. Experimental values of the parameters Dq (cubic) and v (trigonal) are reported. The nephelauxetic ratio ßM is evaluated from the 4A2g 2T2g intra-subshell transitions. The electron transfer spectra suggest the optical electronegativity x0pt = 2.3 for Tc(IV) and xopt = 2.1 for Re(IV). 
  Reference    (Z. Naturforsch. 28a, 89 [1973]; eingegangen am 4. Dezember 1972) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0089.pdf 
 Identifier    ZNA-1973-28a-0089 
 Volume    28 
19Author    Requires cookie*
 Title     
 Abstract    x p e rim e n ta l R e s u lts o n th e D y n a m ic P o la ris a tio n in a S o lid b y V a ria tio n o f T e m p e ra tu re J. H au p t A description of the apparatus for a new dynamic polarization effect by variation of temperature, and the experimental results obtained, are presented. As described earlier a tempe­ rature jump produces a very large enhancement of the dipolar signal (about 10.000) in solid y-picolene due to the dipolar couplings between the protons of the CH3-group and the modes of the CHj-rotator with the crystal phonons. A simple phenomenological model for the inter­ pretation of the experimental data is introduced. Within the experimental errors agreement between model and data is obtained. From the shape of the measured polarization curves a dipolar polarization time Tp and the dipolar relaxation time T(i is determined. From the maxima of the polarization at different tem­ perature jumps a curve dependent only on the temperature is constructed, which together with Tp and Ja characterizes completely the dynamic polarization behaviour. A comparison of the Zeeman-and dipolar relaxation with earlier measurements on similar molecules containing CH3-groups shows that the CH3-rotation in solid y-picolene is almost unhindered and that the "relaxation efficiency" is very low. These last conditions are important for a large enhancement of the dipolar polarization. 
  Reference    (Z. Naturforsch. 28a, 98 [1973]; received 4 December 1972) 
  Published    1973 
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 Identifier    ZNA-1973-28a-0098 
 Volume    28 
20Author    Requires cookie*
 Title    Ü  
 Abstract    b e r E n e rg ie n v o n D r a h te x p lo s io n s s to ß w e lle n H. J ä g e r und R. S chöfer 
  Reference    (Z. Naturforsch. 28a, 105 [1973]) 
  Published    1973 
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 TEI-XML for    default:Reihe_A/28/ZNA-1973-28a-0105.pdf 
 Identifier    ZNA-1973-28a-0105 
 Volume    28 
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