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  • 1
    Electronic Resource
    Electronic Resource
    Structure of langite, Cu4[(OH)6|SO4].2H2O (1984)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 1309-1311 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270184007769
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  • 2
    Electronic Resource
    Electronic Resource
    An upper limit on the aperture separation of ion drift meters (1982)
    Springer
    Astrophysics and space science 83 (1982), S. 37-49 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An upper limit has been calculated on the effective aperture separation or detector thickness of ion drift meters of two fundamental types. The limit applies to meters which compare currents collected by detectors with different view directions at the same retarding potential and to meters which measure the entire thermal ion distribution function. For both types, a single scanned detector may be employed instead of multiple detectors, in which case the limit applies to twice the radius of curvature of the path followed by the detector aperture during a scan, (i.e. the diameter of a spinning payload). The limit was found to be important in two cases. First, in the F region on spacecraft with stringent electrostatic cleanliness requirements, the 10% error limit was found to be 40 cm. Second, in the E region, the limit was found to be ≲1 cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648537
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  • 3
    Electronic Resource
    Electronic Resource
    Expansion of three-phase contact line after rupture of thin non-symmetrical films (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 1206-1207 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Der Einfluß des pH-Wertes auf die Ausbreitung der Dreiphasenkontaktlinie im System Quarz/Dodecylaminhydro, chloridlösung/Luftblase und dem Zerreißen eines dünnen Flüssigkeitsfilmes wird diskutiert und als Folge der Adsorptionsdichte des Tensids an den Grenzflächen fest/flüssig und flüssig/Gas erklärt.
    Notes: Summary The influence of pH on the expansion of three-phase contact line in the system quartz-dodecyl amine hydro chloride solution-air bubble after rupture of thin liquid film is discussed and explained as a consequence of adsorption density of surfactant at the solid-liquid and liquid-gaseous interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382471
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  • 4
    Electronic Resource
    Electronic Resource
    Expansion of three-phase contact line after rupture of thin non-symmetrical liquid films (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 109-110 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Ein wichtiger Vorgang bei der Wechselwirkung von Gasblase und Teilchen in flüssiger Phase ist die Bewegung des Dreiphasenkontaktperimeters sofort nach dem Zerreißen des dünnen Flüssigkeitsfilmes, deren Geschwindigkeit für das System ebene Quarzoberfläche/wäßrige Dodecylaminhydrochloridlösung mittels Zeitlupenkamera gemessen wurde. Die Ergebnisse werden auf Grundlage einer Theorie zur Hydrodynamik dünner Flüssigkeitsfilme diskutiert.
    Notes: Summary One of the important stages in the process of interaction between a particle and a gas bubble in the liquid phase is the expansion of three-phase contact perimeter immediately after rupture of the thin liquid film. The rate of expansion for the system flat quartz surface/liquid dodecylamine hydrochloride solution is determined by use of a high-speed camera. The results were discussed on the basis of a theory on hydrodynamics of thin liquid films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474965
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  • 5
    Electronic Resource
    Electronic Resource
    Impact broadening and shift of RbnS andnD levels by noble gases (1982)
    Springer
    The European physical journal 307 (1982), S. 13-24 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The impact broadening and shift of RbnS andnD levels by the noble gases He, Ar and Xe have been measured by Doppler-free two-photon absorption from the 5S ground state in a thermionic diode up to high principal quantum numbers. The dependence of the broadening rates onn was found to be in qualitative agreement with theoretical data. While the broadening and shift rates of the RbnS andnD levels due to collisions with He or Ar show only slightly different dependences along the series, the corresponding Rb-Xe data present strong differences indicating large contributions by inelastic collisions. For largen the broadening data were found to be independent of the principal quantum number and the angular momentuml. The measured constant values cannot be explained by taking only into account the polarisation contribution. It was found to be a factor of 1.5 to 2 larger than the corresponding theoretical predictions. The shift rates aren-andl-independent and in satisfactory agreement with theoretical values for large principal quantum numbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416067
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  • 6
    Electronic Resource
    Electronic Resource
    Impact broadening of Sr 5sns 1 S 0, 5snd 1D2 and 5snd 3 D 2 levels by He and Xe (1982)
    Springer
    The European physical journal 309 (1982), S. 19-25 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The impact broadening of strontium 5sns 1 S 0, 5snd 1 D 2 and 5snd 3 D 2 levels by He and Xe have been studied by measuring the collisional half-widths of Doppler-free two-photon absorption lines from the 5s 2 1 S 0 ground state in a thermionic diode. Large inelastic contributions to the broadening rates of the levels have been found where the moduli of the quantum defects of different level series are close to each other. A similar but continuousn-mixing behaviour along the series has also been found in our recent investigation on the broadening of Rb levels by noble gases. The broadening rates of the very high levels in Sr were found to be independent on the principal quantum number and the angular momentum of the levels and in good agreement with our recent broadening data of the Rb-He and Rb-Xe systems and the data for Na-He and Na-Xe found by the Columbia group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420146
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  • 7
    Electronic Resource
    Electronic Resource
    Expansion of three-phase contact line after rupture of thin non-symmetrical liquid films (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 767-768 
    Details
    ISSN: 1435-1536
    Keywords: Expansion of three-phase contact perimeter ; Octadecylamin monolayers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es wurde die Ausbreitungsgeschwindigkeit des Dreiphasenkontaktperimeters auf Monoschichten von Octadecylamin (Substrat:Quarz) unterschiedlicher Zahl untersucht und die Ergebnisse auf Grundlage einer Theorie zur Dimplebildung diskutiert. Korrelationen zwischen der Adsoptionsdichte an Tensid an der Grenzfläche flüssig/Gas, der Geschwindigkeit des Dreiphasenkontaktperimeters und der Induktionszeit werden aufgezeigt.
    Notes: Summary Rate of expansion of three-phase contact perimeter at monolayers of octadecyl amine (substrate:quartz) of different numbers was investigated and the results were discussed on the basis of a theory for dimple formation. Correlations between adsorption density of surfactant at the liquid/gaseous interface, velocity of three-phase contact perimeter and induction time are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419323
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  • 8
    Electronic Resource
    Electronic Resource
    The frequency dependence of phonon interactions at Terahertz-frequencies studied by time-resolved phonon spectroscopy (1981)
    Springer
    The European physical journal 41 (1981), S. 1-7 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Phonon properties concerning propagation, frequency spectrum and lifetime in the Terahertz range have been investigated. The phonons have been produced by square wave Joule heating of thin constantan films evaporated onto a strongly doped ruby. Cross sections for phonon scattering at the Cr3+ impurity ions of the ruby were determined as a function of frequency. The theoretical estimate for mass defect scattering given by Klemens [9] is found to agree reasonably with the experimental results. Lifetime measurements indicate that phonons in ruby preferentially propagate in the transversal mode. Phonon frequency spectra in the constantan films were measured under experimental conditions, where the strength of electron phonon coupling is significant; thus electron-phonon relaxation times could be obtained as a function of frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301403
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  • 9
    Electronic Resource
    Electronic Resource
    Impact broadening of alkali Rydberg levels in pure and mixed alkali vapours (1983)
    Springer
    The European physical journal 312 (1983), S. 329-338 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the broadening, and in one case also the shift, of alkalinS andnD Rydberg levels by alkali perturbers (Cs by Cs, Rb by Cs and K, and K by Rb) applying the Doppler-free two-photon technique and thermionic detection. Taking into account recent experimental data for the self-broadening of K and Rb Rydberg levels we found that for low principal quantum numbersn the broadening data of the levels are in agreement within the limits of experimental uncertainty in the pure and mixed cases. For highn we could establish that the broadening of the levels is governed by the perturber-valence electron and the perturber-ion core interaction. With increasingn the broadening rates are only dependent on the sort of perturber. As reported recently for Rb-Rb and K-K, oscillations in the broadening data as a function ofn were also observed for Cs-Cs and in the mixed vapours. Our results do not support recent theories which describe the oscillations in terms of resonances in the scattering of the quasifree valence electron on the perturber atom. In a classical absorption experiment oscillations in the self-broadening and shift of the Cs principal series lines discovered by Mazing and Serapinas were found to be due to satellite structures which are merged in non-Lorentzian line wings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414060
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  • 10
    Electronic Resource
    Electronic Resource
    Impact broadening of very high Rb Rydberg levels by Xe (1983)
    Springer
    The European physical journal 312 (1983), S. 339-342 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With an improved experimental set-up we have studied the broadening of Rb Rydberg levels by xenon up to principal quantum numbers as high asn≈100 by means of Doppler-free two-photon spectroscopy and the thermionic detection technique. The inealstic part of the collision cross section tends to decrease slowly withn in the range 50≦n≦100 in agreement with theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414061
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