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  • Chemistry  (7)
  • 79.20.Nc  (3)
  • Surface topography  (1)
  • atomic structure;  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Depth-profiling of Cu-Ni sandwich samples by secondary ion mass spectrometry (1975)
    Springer
    Applied physics 8 (1975), S. 359-360 
    Details
    ISSN: 1432-0630
    Keywords: Secondary ion mass spectrometry ; Depth profiling ; Surface topography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract SIMS depth profiles of copper-nickel thin film targets were measured with argon and nitrogen primary ions. While pronounced cone formation is observed in case of argon irradiation the erosion is much more uniform with nitrogen projectiles, probably due to formation of nitride surface layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898370
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of solids by secondary ion and sputtered neutral mass spectrometry (1985)
    Springer
    Applied physics 37 (1985), S. 211-220 
    Details
    ISSN: 1432-0630
    Keywords: 79.20.Nc ; 07.75.+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A mass spectrometer is described, which allows the analysis of sputtered neutral and charged particles as well as of residual gas composition. This combined SIMS, SNMS, and RGA instrument consists of a scanning primary ion beam column, an electron impact ionizer, an electrostatic energy filter and an rf quadrupole mass analyzer. Various examples of surface and bulk analysis are presented which demonstrate the beneficial complementary features of these techniques. These are, in particular: a substantial reduction of the matrix effect and fewer complications with samples of low electrical conductivity in SNMS, and the possibility of measuring the depth distribution of gases included in small cavities in the solid in the SNMS/RGA mode. SIMS, on the other hand, allows in many cases higher detection sensitivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614819
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  • 3
    Electronic Resource
    Electronic Resource
    On the chemical sputtering of oxygen-exposed molybdenum (1986)
    Springer
    Applied physics 40 (1986), S. 197-202 
    Details
    ISSN: 1432-0630
    Keywords: 79.20.Nc ; 68.90.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The sputtering of oxygen-exposed molybdenum was studied by means of mass analysis of emitted neutral and charged particles. The irradiation was performed with 8 keV Ar+ ions at temperatures of 25° and 485°C. It was found that the enhanced sputtering yield at elevated temperature during oxygen exposure is due to beam-induced desorption of MoO2 and cascade sputtering of MoO. At this temperature considerable oxygen incorporation also takes place owing to recoil mixing and diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616594
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  • 4
    Electronic Resource
    Electronic Resource
    The emission of neutral clusters in sputtering (1989)
    Springer
    Applied physics 48 (1989), S. 261-271 
    Details
    ISSN: 1432-0630
    Keywords: 79.20.Nc ; 36.40.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The mass, angle, and energy resolved emission of neutral clusters in sputtering was studied for a variety of metals and semiconductors. The main phenomena and results are the following: (i) Cluster emission from a series of transition metals reveals a prominent contribution of clusters to the total flux of ejected particles but there is no simple scaling of cluster intensities with the average sputtering yields. With increasing number of constituents, relative intensities of neutral clusters decrease much faster than those of secondary-ion clusters. (ii) The relative intensities of clusters emitted from amorphous and crystalline semiconductors are identical, but the energy spectra of Ge n -clusters (n = 1–4) sputtered from Ge (111) peak at a slightly higher energy (1 eV) as compared to spectra taken from amorphous Ge. The intensities of all Ge n -clusters exhibit the same dependence on emission angle; this holds for both the amorphous and crystalline Ge-sample. (iii) The flux of neutral monomers, dimers, and trimers sputtered from Cu(111), Ni(111), and Ag(111) crystals shows a pronouncedly anisotropic emission along the 〈110〉 lattice directions which is ascribed to a momentum alignment in the anisotropic part of the collision cascade. Energy spectra taken along 〈110〉 peak at higher energies than those obtained from a random emission angle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619396
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  • 5
    Electronic Resource
    Electronic Resource
    An inertial model of atoms: atomic spectra as a resonance problem (1997)
    Springer
    Speculations in science and technology 20 (1997), S. 115-132 
    Details
    ISSN: 1573-9309
    Keywords: atoms; ; atomic structure; ; quantization.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Technology
    Notes: Abstract A new model of atoms based on the theory of material waves is proposed. Atoms are characterized by an inertial aggregation of negative charge within the atomic shell, the calculation yields, for hydrogen atoms, an atomic radius of 0.470 nm. Atomic spectra result from radial material waves, quantization being the consequence of boundary conditions imposed on the fundamental wave equation. Stark effects and Zeeman effects are treated in detail, they are referred to deformations and rotations of the atomic shell. An analysis of Stern--Gerlach experiments bases subsequent deflections of single atoms on rotations and interactions of magnetic fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018568721066
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  • 6
    Electronic Resource
    Electronic Resource
    Aminodiacylhydrazin-Umlagerung. 2. Mitteilung. Herstellung von N-(Acyl)-N'-(α-aminoacyl)-hydrazinen aus Säurehydraziden und N-Carboxyanhydriden von α-Aminosäuren (1961)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 44 (1961), S. 1798-1801 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Carboxy-aminosäureanhydride eignen sich ausgezeichnet zur α-Aminoacylierung von Säurehydraziden. In Verbindung rnit der Aminodiacylhydrazin-Umlagerung werden sie zu brauchbaren Ausgangsmaterialien für die Peptidsynthese.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19610440639
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  • 7
    Electronic Resource
    Electronic Resource
    Aminodiacylhydrazin-Umlagerung Ein weiteres neues Aufbauprinzip in der Peptidsynthese 1. Mitteilung. Umlagerung von N-(Carbobenzoxyglycyl-glycyl)-N'-(phenylalanyl)-hydrazin in Carbobenzoxyglycyl-glycyl-phenylalanin-hydrazid (1961)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 44 (1961), S. 1794-1798 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus N-geschützten Aminosäurehydraziden kann man N-geschützte Dipeptidhydrazide erhalten, aus diesen N-geschützte Tripeptidhydrazide usw., indem man den NH2-Stickstoff der Hydrazidgruppe jeweils mit einer α-Aminosäure acyliert und das gebildete Aminodiacylhydrazin einer Umlagerung unterwirft. Für diesen neuen Umlagerungstypus wird die Bezeichnung Aminodiacylhydrazin-Umlagerung vorgeschlagen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19610440638
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  • 8
    Electronic Resource
    Electronic Resource
    Aminodiacylhydrazin-Umlagerung 4. Mitteilung Studien zur Reaktionsgeschwindigkeit (1964)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 47 (1964), S. 1625-1642 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rearrangement of N-acyl-N'-a-aminoacyl-hydrazines (I) has been studied in niore detail.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19640470627
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  • 9
    Electronic Resource
    Electronic Resource
    Aminodiacylhydrazin-Umlagerung. 3. Mitteilung. Säure-Base-Eigenschaften von α-Aminodiacylhydrazinen (1961)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 44 (1961), S. 2154-2159 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden die scheinbaren Dissoziationskonstanten einiger α-Aminodiacyl-hydrazine und einer Anzahl von Vergleichssubstanzen angegeben (Tabelle 1). α-Aminodiacylhydrazine sind Ampholyte mit pK′A1 ∼ 7 und pK′A2 ∼ 10; K′A1, ist der protonierten α-Aminogruppe, K′A2 der Diacylhydrazin-Gruppierung zuzuordnen. Dies ergibt sichaaus dem Vergleich mit den Säure-Base-Eigenschaften verwandter Verbindungen,baus dem Vergleich der Dissoziationswärmen (Tabelle 2),caus dem Vergleich der Titrationskurven in Wasser und 75-proz. Äthanol (Tabelle 3).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19610440743
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Triterpene. 123. Mitteilung. Über das Δ12,13-Oleanen-ol-(30) (1948)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 31 (1948), S. 157-160 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19480310134
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