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  • Articles  (36)
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  • Articles  (36)
  • Other Sources  (1)
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  • 11
    Electronic Resource
    Electronic Resource
    Totale Streuquerschnitte für den Stoß von H2, D2 und He an den Edelgasen Ne, Ar, Kr und Xe im thermischen Energiebereich (1968)
    Springer
    The European physical journal 208 (1968), S. 215-233 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The velocity dependence of the total elastic cross section has been measured for the scattering of H2, D2, and He beams by Ne, Ar, Kr, and Xe gases. Velocity-selected beams were attenuated by gas in a scattering chamber. A universal detector, with a magnetic mass separator, was used in conjunction with lock-in techniques. The results are compared with quantum mechanical calculations using a Lennard-Jones-(12.6)-potential, and employing suitable averaging over experimental velocity distributions. Potential parameters are presented. These are in good agreement with those expected from other methods of measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379913
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  • 12
    Electronic Resource
    Electronic Resource
    Messungen der van der Waals-Wechselwirkung zwischen Edelgasatomen (1965)
    Springer
    The European physical journal 188 (1965), S. 468-479 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Total cross sections for collisions of Helium atoms with other rare gases have been measured by modulated molecular beam technique. The results are used to determine the interaction constants of the van der Waals potential (V(r)∼ −C/r 6). For this purpose, an indirect procedure is adopted, since the well known approximation ofMassey andMohr (Q∼C 2/5) is not applicable for Helium scattering experiments at thermal energies. The van der Waals constants obtained are in agreement with values determined from experimental data on transport properties in gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01339877
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  • 13
    Electronic Resource
    Electronic Resource
    Effektive Stoßquerschnitte bei Streuversuchen (1962)
    Springer
    The European physical journal 166 (1962), S. 406-428 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Scattering experiments are often not performed with the ideal set-up consisting of a monochromatic beam and target particles at rest. This is, for instance, never the case in molecular beam scattering, which is of primary interest in this paper. Two arrangements are normally employed, one consisting of a gas chamber as target (case a), the other of a crossed beam, generally at right angles to the incoming beam (case b). In both cases the scattering particles have a Maxwellian velocity distribution. This means that in any such experiment an “effective cross section” is measured, which is an integral over cross sections for different collision velocities. Other similar integrals are needed, if one works with polarized beams and takes into account the fact that the cross section is angular dependent. A third type of integral is required, when the primary beam is not monochromatized, and one has to average over its velocity distribution too. The functions needed to interpret scattering experiments of all the types mentioned are given in this paper, as well as a table of values for the 24 most important of these functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384175
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  • 14
    Electronic Resource
    Electronic Resource
    Differentielle Streuquerschnitte bei der Wechselwirkung neutraler Moleküle Messungen der Kleinwinkelstreuung (1964)
    Springer
    The European physical journal 179 (1964), S. 16-37 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A molecular beam apparatus of high angular resolution is described, and measurements of the angular intensity distribution of alkali beams scattered at small angles (15 seconds of arc to 1 degree) by crossed beams of various gases and vapours are presented. Formulas, connecting the measured intensity with the differential cross section in the center of mass system, are derived, considering the velocity distribution in the beams and the geometry of the experimental set-up. The measurements show, that the differential cross section can be calculated down to very low angles (order of magnitude 10 minutes of arc) by means of classical mechanics, taking only into account the long-range attractive van der Walls interaction. At smaller angles, deviations, predicted by quantum mechanics, can be observed. If the potential of the van der Waals forces is written in the formV(r)=−C/r s, a method is outlined to determine bothC ands from the measured angular intensity distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379211
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  • 15
    Electronic Resource
    Electronic Resource
    Darstellung und oxidative Derivatisierung von Dialkylthiophosphiten (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 617 (1992), S. 148-154 
    Details
    ISSN: 0044-2313
    Keywords: Phosphonothionic esters ; preparation ; oxidation with carbon tetrachloride ; thiophosphoric acid derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Oxidative Derivatisation of Phosphonothionic EstersThe kind of the amine used influences decisively course and rate of the reaction of trialkyl phosphites, (RO)3P (R = Me, Et, Ph) with H2S in the presence of different amines (Et3N, Et2NH, Et2NPh, pyridine). Phosphonothionic esters, (RO)2P(S)H (R = Me, Et, Bu), are obtained in over 80% yield by using pyridine as base and an alkali alcoholate as catalyst. The oxidative derivatisation of phosphonothionic esters by means of CCI4 and protic (4-nitrophenol, 2,4,5-trichlorophenol, ammonia, piperidine, phenylhydrazine) or anionic nucleophiles (F-, NCS-, NCO-, CN-, N3-) (Atherton-Todd reaction) yields thiophosphoric acid derivatives (RO)2P(S)Nuc (R = Me, Et, Bu: Nuc = 4-nitrophenoxy, PhNHNH; R = Me, Et: Nuc = 2,4,5-trichlorophenoxy, F, NCS, N3; R = Me: NH2, C5H10N; R = Et: Nuc = CI, CN) and in some cases the dealkylated products (RO)P(Nuc)SO- (R = Me; Nuc = CI, F, NCS, CN). The phosphazenes (EtO)2P(S)—N = PPh3 and (MeO)2P(S)—N = P(OEt)3, up to now unknown in literature, were obtained by treating thiophosphoryl azides with PPh3 or P(OEt)3, resp.
    Notes: Geschwindigkeit und Verlauf der Reaktion von Triestern der phosphorigen Säure, (RO)3P (R = Me, Et, Ph) mit H2S in Gegenwart verschiedener Amine (Et3N, Et2NH, Et2NPh, Pyridin) werden entscheidend von der Art des verwendeten Amins beeinflußt. Bei Verwendung von Pyridin als Base und Alkalialkoholaten als Katalysatoren werden Thiophosphorigsäuredialkylester, (RO)2P(S)H (R = Me, Et, Bu), mit über 80% Ausbeute erhalten. Die oxidative Derivatisierung der Thiophosphite mit CCI4 und protischen (4-Nitrophenol, 2,4,5-Trichlorphenol, Ammoniak, Piperidin, Phenylhydrazin) bzw. anionischen Nucleophilen (F-, NCS-,NCO-, CN-, N3-), (Atherton-Todd-Reaktion) ergibt Thiophosphorsäurederivate (RO)2P(S)Nuc (R = Me, Et, Bu: Nuc = 4-Nitrophenoxy, PhNHNH; R =; Me, Et: Nuc = 2,4,5-Trichlorphenoxy, F, NCS, N3; R = Me: NH2, C5H10N; R = Et: Nuc = CI, CN) und z. T. deren Entalkylierungsprodukte (RO)P(Nuc)SO- (R = Me; Nuc = CI, F, NCS, CN). Die Umsetzung der Thiophosphorylazide mit PPh3 bzw. P(OEt)3 ermöglichte die Darstellung der noch nicht beschriebenen Phosphazene (EtO)2P(S)—N = PPh3 und (MeO)2P(S)—N = P(OEt)3.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926170126
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  • 16
    Electronic Resource
    Electronic Resource
    Zur Direktsynthese von Trialk(ar)ylphosphiten und -trithiophosphiten aus elementarem Phosphor (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 217-223 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Direct Synthesis of Trialk(ar)yl Phosphites and Trialk(ar)yl Trithiophosphites from Elemental PhosphorusIn the presence of triethylamine trialk(ar)yl phosphites, P(OR)3, and trialk(ar)yl trithiophosphites, P(SR)3, (R = alk, ar) can be produced in good yields by treating elemental phosphorus, P4, with CCl4 and alcohols or thiols, resp., in dipolar-aprotic solvents. Whereas. Whereas in the reaction with alcohols the P4 degradation happens according to scheme 1, the reaction with thiols occurs via the intermediate formation of disulfanes, R2S2, which then react with P4 forming the trithiophosphites (eqs. (6) and (7)).
    Notes: In dipolar-aprotischen Lösungsmitteln lassen sich Trialk(ar)ylphosphite und -trithiophosphite, P(OR)3 bzw. P(SR)3 (R = Alk, Ar), in guten Ausbeuten durch die Umsetzung von P4 mit CCl4 und Alkoholen bzw. Thiolen in Gegenwart von Triethylamin herstellen. Während der P4-Abbau in der Reaktion mit den Alkoholen entsprechend Schema 1 erfolgt, verläuft die Reaktion mit den Thiolen über die intermediäre Bildung von Disulfanen, R2S2, die ihrerseits mit P4 zu den Trithiophosphiten reagieren (Gl. (6) und (7)).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905800126
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  • 17
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    Negative ion formation from surfaces under bombardment of a superthermal potassium neutral beam (1976)
    American Institute of Physics
    Details
    Publication Date: 1976-07-15
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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  • 18
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    Totale Streuquerschnitte für den Stoß von H2, D2 und He an den Edelgasen Ne, Ar, Kr und Xe im thermischen Energiebereich (1968)
    Springer
    Details
    Publication Date: 1968-06-01
    Print ISSN: 0939-7922
    Electronic ISSN: 1431-5831
    Topics: Physics
    Published by Springer
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  • 19
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    Crossed‐Beam Study of Ionization of Cs by Br2 (1969)
    American Institute of Physics
    Details
    Publication Date: 1969-08-15
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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  • 20
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    Chemical reactions stimulated by superthermal beams (1976)
    American Institute of Physics
    Details
    Publication Date: 1976-10-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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