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1966 (403)
1Author    F. Rüdenauer, F. P. ViehböckRequires cookie*
 Title    A Numerical Method for the Calculation of Image Aberrations of Inhomogeneous Magnetic Sector Fields Between Conical Pole Faces  
 Abstract    Dedicated to Prof. J. MATTAUCH on his 70th birthday Owing to their increased dispersion magnetic analysers with inhomogeneous magnetic fields may be useful for various applications e. g. nuclear spectroscopy, mass spectroscopy, and isotope separation. This inhomogeneity may be aquired by conically shaped pole faces. BOERBOOM and 
  Reference    (Z. Naturforschg. 21a, 2—8 [1966]; received 2 August 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0002.pdf 
 Identifier    ZNA-1966-21a-0002 
 Volume    21 
2Author    Isao TakeshitaRequires cookie*
 Title    Matrix Representation for Calculation of the Second-Order Aberration in Ion Optics  
 Abstract    Dedicated, to Prof. J. MATTAUCH on his 70th birthday The matrix representation for calculating the ion trajectory is extended to include the second-order aberration terms. Properties of the matrix and relations between its elements are discussed. As an example of the application of the matrix method, the second-order coefficients of a homo-geneous magnetic field of arbitrary shape are derived and the relations between the matrix ele-ments and HINTENBERGER'S notations are shown. 
  Reference    (Z. Naturforschg. 21a, 9—14 [1966]; received 24 April 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0009.pdf 
 Identifier    ZNA-1966-21a-0009 
 Volume    21 
3Author    Isao TakeshitaRequires cookie*
 Title    Mattauch-Herzog Type Mass Spectrograph with a Two Stage Electrostatic Field  
 Abstract    Dedicated to Prof. J. MATTAUCH on his 70th birthday The most important advantage of the MATTAUCH-HERZOG type mass spectrograph is double focus-ing for all masses. One disadvantage, however, is the fact that the energy slit cannot control the velocity spread (ß) independently of beam divergence (a). This disadvantage is removed by sub-stituting a two-stage electrostatic field for the usual single one. General formulae for determining the distances between the elements of the optical system are derived. Combinations of two cylindrical electrostatic fields with equal radii are chosen as a practical example. The condition to be fulfilled for a physically significant solution and the resolving power of this system are discussed. The study of the second-order aberrations shows that a 2 focusing for all masses can be achieved under suitable conditions. In addition, a ß and ß 2 aberrations can be made to vanish simultaneously at a point on the focal plane. The design parameters are numerically computed and tabulated for several favorable examples. The total image defect is calculated for a typical example, and found to be very small for a wide range of masses. 
  Reference    (Z. Naturforschg. 21a, 14—25 [1966]; received 24 April 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0014.pdf 
 Identifier    ZNA-1966-21a-0014 
 Volume    21 
4Author    H. Matsuda, S. Fukumoto, Y. Kuroda, M. NojiriRequires cookie*
 Title    A New Mass Spectrograph with Very Large Dispersion  
 Abstract    J. MATTAUCH on his 70th birthday A new type of mass spectrograph with large mass dispersion has been constructed. The distin-guishing feature of this apparatus is that the mass dispersing action of a 1 magnetic field is utilized. The instrument has a r -1 magnetic field of 198.1° sector type (22 cm mean radius) as the dispersing field, a toroidal electric field of 118.7° sector type (30 cm mean radius) and a 30° uni-form magnetic field (120 cm mean radius) as the focusing fields. The principle, the design and important parts of the apparatus are described. The dispersion on the photographic plate was esti-mated to be 14 cm for 1% mass difference and the maximum resolving power of about 500,000 was obtained. 
  Reference    (Z. Naturforschg. 21a, 25—33 [1966]; received 19 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0025.pdf 
 Identifier    ZNA-1966-21a-0025 
 Volume    21 
5Author    Herrn Prof, J. Dr, MattauchRequires cookie*
 Title    Deutsch-Französisches Forschungsinstitut Saint-Louis  
 Abstract    I. Die Konzeption des Apparates Es wird ein Massenspektrograph vorgeschlagen, der aus einem homogenen Magnetfeld M und einem vorgeschalteten elektrischen Radialfeld E mit gleich-sinniger Ablenkung besteht (siehe Abb. 1). Das Radialfeld hat einen Ablenkwinkel #e = 127°17'. Der Ablenkradius sei re . Das Magnetfeld besitzt nur eine einzige Begrenzungsgerade. Die optische Achse zwischen dem Radialfeld und dem Magnetfeld bildet mit der Senkrechten zur Begrenzungsgeraden den Winkel f0 = arctan(l/2)|/2 = 35° 16'. Der Ablenk-winkel 0 im Magnetfeld ist für alle Ionensorten konstant = n — 2 £0 = 109° 28'. Der Austrittswinkel der optischen Achse ist ebenfalls £0 . 
  Reference    (Z. Naturforschg. 21a, 34—36 [1966]; eingegangen am 22. Juli 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0034.pdf 
 Identifier    ZNA-1966-21a-0034 
 Volume    21 
6Author    J. Franzen, K.-H Maurer, K. D. Schuy, Herrn Professor, J. MattauchRequires cookie*
 Title    Über den Ionennachweis mit Photoplatten  
 Abstract    Part I. The transparency curve, produced by ions of 10 — 100 keV, can be described by / eN T — transparency, Ts = transparency at saturation, e = photographic sensitivity, N = number of ions incident per unit area, V = parameter of the size-frequency distribution of the AgBr grain impact areas. The equation is derived from basic principles by suitably modifying KINOSHITA'S assumptions 1 . Agreement with experimental curves is demonstrated. Part II. The shape of the transparency curve (T vs. log of ion density) was investigated for several developers at various developing temperatures and developing times, for the improved 
  Reference    (Z. Naturforschg. 21a, 37—62 [1966]; eingegangen am 6. Juli 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0037.pdf 
 Identifier    ZNA-1966-21a-0037 
 Volume    21 
7Author    JohnD. Macdougall, William Mclatchie, Scott Whineray, HenryE Duckworth ++Requires cookie*
 Title    Precise Atomic Mass Differences Involving Isotopes of Nd, Sm, Cd, and Pb  
 Abstract    Dedicated to Prof. J. MATTAUCH on his 70th birthday During the past year, certain of our experimental techniques have been re-evaluated and modi-fied. In the course of these investigations, we have re-determined two atomic mass differences in-volving isotopes of cadmium and one involving isotopes of lead. The new values are consistent with reaction data and with our older measurements. Thirteen mass differences involving isotopes of neodymium and samarium have also been determined, several for the first time. These new results are consistent with reaction data and with other recent mass spectroscopic data, but indicate that our previously-reported mass differences in the neodymium-samarium region are systematically too large by small but real amounts. An unusually concordant situation now exists in this region of the mass table. 
  Reference    (Z. Naturforschg. 21a, 63—68 [1966]; received 20 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0063.pdf 
 Identifier    ZNA-1966-21a-0063 
 Volume    21 
8Author    A. H. WapstraRequires cookie*
 Title    A Correction to the 1964 Mass Table  
 Abstract    Dedicated to Prof. J. MATTAUCH on his 70th birthday Very probably, the masses of all nuclides decaying by an a— ß decay chain into 213 Bi are low by about 150 keV. 
  Reference    (Z. Naturforschg. 21a, 68—69 [1966]; received 15 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0068.pdf 
 Identifier    ZNA-1966-21a-0068 
 Volume    21 
9Author    JesseW M DumondRequires cookie*
 Title    The Present Key Importance of the Fine Structure Constant,a, to a Better Knowledge of All the Fundamental Physical Constants  
 Abstract    Dedicated, to Prof. J. MATTAUCH on his 70th birthday The dilemma is described which exists at the present time between the two present best sources of information as to the numerical value of the SOMMERFELD fine structure constant, a. These two sources are the fine structure splitting in deuterium, determined in 1953 by TRIEBWASSER, DAYHOFF and LAMB, and the hyperfine structure splitting in hydrogen, measured more recently using the 
  Reference    (Z. Naturforschg. 21a, 70—79 [1966]; received 20 October 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0070.pdf 
 Identifier    ZNA-1966-21a-0070 
 Volume    21 
10Author    H. KümmelRequires cookie*
 Title    A Note on the Theory of Decaying Systems and the Computation of Decay Rates  
 Abstract    Dedicated to Prof. J. MATTAUCH on his 70th birthday The theory of decaying systems of FRANZ 1 —which seems finally to settle the basic questions left open so far —has been reformulated assuming a slightly altered initial situation. The currently used formulae for the decay rates (see MANG 2) have been derived as an approximation to this practically rigorous theory. 
  Reference    (Z. Naturforschg. 21a, 79—83 [1966]; received 8 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0079.pdf 
 Identifier    ZNA-1966-21a-0079 
 Volume    21 
11Author    N. Takaoka, K. OgataRequires cookie*
 Title    The Half-life of 130 Te Double ^-decay  
 Abstract    Dedicated to Prof. J. MATTAUCH on his 70th birthday In order to determine the half-life of the 130 Te double /?-decay, the amounts and isotopic com-position of xenon extracted from tellurium ores, from the Oya gold mine in Japan, have been measured with a high-sensitivity mass spectrometer. Compared with atmospheric xenon an excess was definitely found at mass numbers 129, 130 and 131 in the extracted xenon. The excess of 130 Xe is predominant, the average amount in three samples being (1.32 ±0.09) x 10 -11 ccSTP/g 130 Te. Attributing the excess 130 Xe to the double /?-decay of 130 Te, the half-life is estimated to be (8.20 ± 0.64) x 10 20 years, assuming an age of (9.06 ± 0.29) x 10 7 years for the Te ores. The latter value is the K-Ar age of porphyrite, which is in close geological connection with the Te ores. In order to investigate the other excesses than that of 130 Xe, isotopic analyses were also carried out on Xe from three other Te ores from the same mine. The ratios (129 Xe/ 131 Xe) excess =1.58 and (129 Xe/ 130 Xe) excess = 2.1 were found to be the same for all samples. The origin of these excesses is discussed. In addition a small excess of 128 Xe was found. If this is attributed to 128 Te double /?-decay, the half-life of 128 Te is estimated to be 3 x 10 22 years, a value shorter by about three orders of magni-tude than the theoretically expected half-life. The above estimated half-life may be a lower limit of the 128 Te half-life. The general tendency of the isotopic abundances (except for the above excesses), of the xenon extracted from Te ores seems to be to slightly increase in excess as one moves toward the lighter isotopes (as compared with atmospheric xenon). In the mass Table there are about fifty nuclei for which double /?-decay is energetically possible. 130 Te is one of them. The energy level scheme for its double /?-decay 1 is shown in Fig. 1. Double /?-decay has been studied theoretically by many physicists 2 ~ 8 . Accordding to their theoretical analyses, its proba-bility is extremely small, with strong dependence on the decay energy. According to PRIMAKOFF and 
  Reference    (Z. Naturforschg. 21a, 84—90 [1966]; received 15 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0084.pdf 
 Identifier    ZNA-1966-21a-0084 
 Volume    21 
12Author    HansE. Suess, Herrn Professor, J. MattauchRequires cookie*
 Title    Zur Theorie der Entstehung der Atomkerne unseres Sonnensystems  
 Abstract    Im allgemeinen hält man die Schwierigkeiten, die den Theorien der Elemententstehung anhaften, durch die Annahme für überwunden, daß die Elemente unseres Sonnensystems Mischungen dar-stellen von Kernsorten, die auf verschiedene Weise, zu verschiedenen Zeiten und an verschiedenen Orten entstanden sind. Gegen diese Vorstellung läßt sich jedoch u. a. ein grundlegender Einwand erheben: Durch Wahl einer geeigneten Klassifizierung der Kernsorten läßt sich zeigen, daß in bestimmten Massengebieten die Kernhäufigkeiten mit dem Gang der Kernbindungsenergien nach 
  Reference    (Z. Naturforschg. 21a, 90—92 [1966]; eingegangen am 30. September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0090.pdf 
 Identifier    ZNA-1966-21a-0090 
 Volume    21 
13Author    H. Wänke, Herrn Professor, J. MattauchRequires cookie*
 Title    Der Mond als Mutterkörper der Bronzit-Chondrite  
 Abstract    Knowing the cosmic ray exposure ages of a sufficiently large number of meteorites and using the earth as analyser with special assumptions, criteria can be found to distinguish between a lunar or asteroidal origin of meteorites. Several of the following arguments are based on new and unpub-lished results of rare gas measurements by HINTENBERGER, SCHULTZ und WÄNKE 70 . Bronzite-chondrites: 1. Arguments for an origin near the surface of the parent body, a) Porosity of the chondrites 0—20%. b) Many bronzite-diondrites contain light primordial rare gases, originating from the exposure of the single meteorite grains to the solar wind, c) Primordial rare gas content always connected with light-dark structure, d) In the distribution of the cosmic ray exposure ages certain groupings can be distinguished. The age distribution of bronzite-diondrites with light primordial rare gases is identical with the distribution of the cosmic ray exposure ages of all bronzite-chondri-tes. The bronzite-chondrites containing primordial gas therefore are probably coming from the very upper layers, and the other bronzite-diondrites from somewhat deeper layers of their parent body. 2. Arguments for an origin close to the earth's orbit, a) Bronzite-chondrites with high cosmic ray exposure ages show a slight tendency to fall in the afternoon (noon until midnight), b) For the bronzite-diondrites, which are morning falls (midnight until noon), diffusion losses of 3 He and 4 He are higher and more frequent compared to the afternoon falls. The reason for this can be found in a closer approach to the sun of the first ones. Hypersthene-chondrites do not show this effect. c) Bronzite-diondrites with light primordial rare gas content concentrate among the afternoon falls. d) The mean cosmic ray exposure age of the bronzite-diondrites is considerably lower than that of the hypersthene-chondrites. 3. Arguments concerning the size of the parent body. Light primordial rare gas and their con-nection with light-dark structure indicate a parent body of the size of the moon or a large asteroid. None of these arguments are strictly conclusive. In some cases they are based on observations, which can only be obtained by using statistical methods. Most of these effects are close to the mean error. Adding, however, all observations together, a lunar origin of the bronzite-diondrites becomes nearly undoubtable. A lunar origin of stone meteorites was in recent times first proposed by UREY 3 . Hypersthene-chondrites: Hypersthene-chondrites with low cosmic ray exposure ages are rare among the morning falls. Their parent body therefore probably has to be found outside the earth's orbit. Their distribution of the cosmic ray exposure ages may also lead to this conclusion. As proposed by ANDERS 4 , the Mars asteroids could possibly be the parent bodies for the hypersthene-chondrites. Mars itself might however be considered also. A lunar origin of the hypersthene-chondrites seems to be completely out of question. Bis vor wenigen Jahren war es die allgemein akzeptierte Ansicht, daß der Ursprung aller Meteorite in den Asteroiden, den kleinen Planeten, die in gro-ßer Zahl zwischen Mars und Jupiter ihre Bahnen ziehen, zu suchen ist. Als es, aufbauend auf den Pionierarbeiten PANETHS und seiner Mitarbeiter 1-2 , möglich wurde mit Hilfe der in den Meteoriten vor-handenen Reaktionsprodukte der Höhenstrahlung ihre Lebensdauer als kleine Körper exakt zu be-stimmen, tauchten bald Zweifel an der Richtigkeit dieser Annahme auf. Zeitliche und räumliche Konstanz der Höhenstrah-lung und konstante Meteoritgröße vorausgesetzt, ist die Einwirkungsdauer der Höhenstrahlung auf die 
  Reference    (Z. Naturforschg. 21a, 93—110 [1966]; eingegangen am 9. Juli 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0093.pdf 
 Identifier    ZNA-1966-21a-0093 
 Volume    21 
14Author    F. Begemann, E. Vilcsek, H. Wänke, Herrn Professor, J. MattauchRequires cookie*
 Title    Die Produktionsraten von 36 C1 und 39 Ar in Metall-und Steinphase des Chondriten Leedey  
 Abstract    The production rates of 36 C1 and 39 Ar by the cosmic radiation on Fe and Ca + K have been determined in the chondrite Leedey. The values of 19.4 atoms/min-kg FFE(36 Cl) ^ 26.6 atoms/min-kg and PFe (39 Ar) = (23.6 ±1.8) atoms/min-kg are in good agreement with those found in iron meteorites of comparable size. A large contribution of Ca+K to the production of both isotopes is indicated by the ratios 9.2 ^ Pea + K (36 C1) /PFe (36 C1) ^ 13.6 and PCa + K (39 Ar) /PFe (39 Ar) = 12.1 ± 1.6. The bearing of these results on the interpretation of 39 Ar-data obtained on other chondrites is being discussed. 
  Reference    (Z. Naturforschg. 21a, 110—115 [1966]; eingegangen am 2. Juli 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0110.pdf 
 Identifier    ZNA-1966-21a-0110 
 Volume    21 
15Author    J. R. Walton, A. E. CameronRequires cookie*
 Title    The Isotopic Composition of Atmospheric Neon  
 Abstract    J. MATTAUCH on his 70th birthday "Absolute" values for the isotopic abundance ratios of atmospheric neon have been determined by mass spectrometry. Calibration standards were prepared by mixing of nearly pure separated nuclides of neon. The percentage abundance of the three nuclides of neon are: 
  Reference    (Z. Naturforschg. 21a, 115—119 [1966]; received 17 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0115.pdf 
 Identifier    ZNA-1966-21a-0115 
 Volume    21 
16Author    T. Kirsten, W. Gentner, Herrn Professor, J. MattauchRequires cookie*
 Title    K-Ar-Altersbestimmungen an Ultrabasiten des Baltischen Schildes  
 Abstract    The K-Ar-ages of five ultrabasic rocks from the Baltic Shield were determined. K-Ar-ages of 3.7 to 8.8x10® y were obtained. Two samples were cut into fractions with different potassium content and a partial correlation of the argon content with the potassium content in the separated fractions was noticed. The question of extraneous argon causing higher age values is discussed. Taking into consideration the previous results obtained by GERLING et al., it may be said, that extremely high Ar 40 /K-ratios are the rule for ultrabasic rocks from the Baltic Shield. As a consequence of this fact, it is not likely that all these rocks have the age only of the precambrian pluton in which they are incorporated. Assuming that the alpinotype peridotites were transported upwards in the form of solid fractions from the upper mantle, it is possible, that actually radiogenic argon exists more or less in the sample. The highest Ar 40 /K-ratios (according to ages ranging from 5.9 to 10.9x10® y) exhibit the samples with potassium contents below 100 ppm. Samples with potassium contents more than l%o have much smaller Ar 40 /K-ratios (according to ages from 4.2 to 5 x 10® y). Excess argon probably causes the extremely high "ages" of more than 7x10® y. The ages from relative potassium-rich samples will eventuible show the true age. The most likely value for this age is 4.2 x lo 9 y, measur-ed for a peridotite with 0.49% potassium content. 
  Reference    (Z. Naturforschg. 21a, 119—126 [1966]; eingegangen am 5. Oktober 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0119.pdf 
 Identifier    ZNA-1966-21a-0119 
 Volume    21 
17Author    A.J H Boerboo M, B. L. Schräm, W. Kleine, J. KistemakerRequires cookie*
 Title    Einfluß der Geschwindigkeit von Edelgasionen auf die Emission von Sekundär-Elektronen  
 Abstract    Herrn Professor J. MATTAUCH zum 70. Geburtstag gewidmet By direct comparison of the signals of a particle multiplier and a FARADAY cage at the collector end of a mass spectrometer, the secondary emission coefficients of a copper-berilium alloy were determined for single and multiply charged noble gas ions. The ions involved were He + and He 2+ , 20 Ne + up to 20 Ne 3+ , 22 Ne + , Ar + up to Ar 5+ , Kr + up to Kr 7+ and Xe + up to Xe 9+ . The energy of the ions varied between 3 and 90 keV. The secondary emission factors show an almost exact linear dependence on the velocity of the ions, with a threshold at 5.5 xlO 6 cm/s. The slopes are proportional to the square roots of the ion masses. 
  Reference    (Z. Naturforschg. 21a, 127—129 [1966]; eingegangen am 16. Oktober 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0127.pdf 
 Identifier    ZNA-1966-21a-0127 
 Volume    21 
18Author    JamesR. Macdonald, JohnH Ormrod ++, HenryE Duckworth +++Requires cookie*
 Title    Stopping Cross Sections in Boron of Low Atomic Number Atoms with Energies from 15 to 140 keV  
 Abstract    Dedicated, to Prof. J. MATTAUCH on his 70th birthday The electronic stopping cross sections in boron for atomic projectiles with Z 11 have been determined in the energy interval 15 to 140 keV. Reasonable agreement is found with theory, however the previously observed periodic dependence of SE on the atomic number of the projectile is also evident. Results for the relative straggling in energy loss are reported for hydrogen projec-tiles in boron, carbon, and aluminium targets and for helium projectiles in boron and carbon. Theoretical straggling estimates agree reasonably well with the experimental results. 
  Reference    (Z. Naturforschg. 21a, 130—134 [1966]; received 20 September 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0130.pdf 
 Identifier    ZNA-1966-21a-0130 
 Volume    21 
19Author    H. Okabe, H. D. Beckey, W. Groth, Herrn Professor, J. MattauchRequires cookie*
 Title    Photochemical Studies by Means of a Field Ion Mass Spectrometer  
 Abstract    A mass spectrometric investigation was carried out on the direct photolyses of propene, 1-butene, and hydrazine at 1849 Ä with a field ion source in a flow system. Comparisons were made with Pt tip and wire emitters. It was found that, without illumination, mass spectra obtained with the wire were accompanied by a number of fragment peaks amounting to almost \%. Since these peaks inter-fere with those produced photochemically, the tip emitter was used mostly for the photochemical studies although it gave 100 times less current and was less stable. The photochemical products formed at a gas pressure of 10 /u by a low pressure mercury lamp were detected after approximately 10 m sec. The three main peaks observed in the propene photolysis were at masses 27, 28, and 56, indicating the processes: 
  Reference    (Z. Naturforschg. 21a, 135—140 [1966]; received 2 August 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0135.pdf 
 Identifier    ZNA-1966-21a-0135 
 Volume    21 
20Author    H. D. Beckey, J. Dahmen, H. KnöppelRequires cookie*
 Title    Über die Feldstärkeabhängigkeit der Winkelverteilung feldemittierter Elektronen und Ionen  
 Abstract    Herrn Professor J. MATTAUCH zum 70. Geburtstag gewidmet The angular distribution of atoms and molecules field ionized at Platinum tips is determined. First, with negative polarity of the tip the angular distribution of the field emitted electrons is measured in order to determine he radius of curvature and the shape of the tip, using calculations of DRECHSLER and HENKEL 2 . 
  Reference    (Z. Naturforschg. 21a, 141—152 [1966]; eingegangen am 22. Juli 1965) 
  Published    1966 
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 TEI-XML for    default:Reihe_A/21/ZNA-1966-21a-0141.pdf 
 Identifier    ZNA-1966-21a-0141 
 Volume    21 
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