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  • 1
    Electronic Resource
    Electronic Resource
    Über die Gasphasenstruktur von CF3NCl2 und die Darstellung von CF3NCl2F+MF6- (M = As, Sb) und CF2 = NClF+SbF6- (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 2066-2070 
    Details
    ISSN: 0044-2313
    Keywords: Dichlorine(trifluoromethyl)amine ; dichlorine-fluorine(trifluoromethyl)ammonium hexafluoroarsenate,-antimonate ; Chlorine(difluoromethylene)fluorineammonium hexafluoroantimonate ; preparation ; gas phase structure of CF3NCl2 ; i.r. spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gas Phase Structure of CF3NCl2 and Preparation of CF3NCl2F+MF6- (M = As, Sb) and CF2 = NCl2F+SbF6-The gas phase structure of CF3NCl2 is reported. The following skeletal parameters are derived (ra-values, error limits are 3σ values): N—C = 1.470(6) Å, N—Cl = 1.733(3) Å, ClNCl = 111.5(4)° and ClNC = 107.6(5)°. CF3NCl2F+MF6- is prepared by fluorination of CF3NCl2 with XeF+MF6-. The same educt CF3NCl2 reacts with XeF+SbF6- at -40°C to CF2 = NClF+SbF6- under elimination of ClF.
    Notes: Es wird über die Gasphasenstruktur von CF3NCl2 berichtet. Der N—C-Bindungsabstand (ra-Wert, Fehlergrenze 3σ-Wert) beträgt 1,470(6) Å, der N—Cl-Abstand 1,733(3) Å und die Bindungswinkel am Stickstoff ClNCl = 111,5(4)° und ClNC = 107,6(5)°.Durch Fluorierung des Amins mit XeF+MF6- (M = As, Sb) können die bis -50°C stabilen Fluorammoniumsalze CF3NCl2F+MF6- synthetisiert werden. Mit dem gleichen Edukt CF3NCl2 reagiert XeF+SbF6- bei -40°C unter ClF-Abspaltung zu CF2 = NClF+SbF6-.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191216
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    Paper (German National Licenses)
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  • 2
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    Stick‐Slip Tremor Beneath an Alpine Glacier (2021)
    Details
    Publication Date: 2021-07-01
    Description: Sliding of glacial ice over its base is typically described by a frictionless or slowly deforming bed. This view is challenged by recent seismic observations of stick‐slip motion at the ice‐bed interface. We revisit a high‐frequency (20–35 Hz) harmonic tremor recorded on Gornergletscher, Switzerland. In contrast to previous interpretation in terms of glaciohydraulic tremor, we present evidence for superimposed stick‐slip episodes as tremor sources: we locate the tremor source with matched field processing polarity optimization, which allows for azimuthal polarity patterns associated with nonisotropic moment tensors and yields a tremor source clustering near the glacier bed. Our analysis confirms an S wave radiation pattern in agreement with a double‐couple source derived from ice sliding over bedrock and explains our tremor observations in terms of glacier stick‐slip motion. Adding to observations of stick‐slip tremor beneath polar ice streams, this first report on stick‐slip tremor beneath Alpine ice favors widespread seismogenic glacier sliding.
    Description: Plain Language Summary: For many years, researchers have observed cryoseismic stick‐slip tremor exclusively in Antarctica. Stick‐slip tremor is due to small repeating slip events at the glacier bed as a glacier advances downstream. This type of tremor is a telltale sign of what is happening at the ice‐bed interface and indicates frictional sliding. Here, we present first evidence for stick‐slip tremor at an Alpine glacier—Gornergletscher, Switzerland. We identify indicators in the seismic signature and apply data processing techniques that reveal that the creeping glacier sole moves under the influence of gravity and irregularly rubs over a sticky area at the bed.
    Description: Key Points: We revisit a harmonic tremor recorded by a seismic array on an Alpine glacier, which was previously interpreted as hydraulic tremor. Applying matched field processing that accounts for nonisotropic radiation patterns suggests a tremor source at the ice‐bedrock interface. A focal mechanism derived from ice slip over bedrock explains our results and suggests seismogenic stick‐slip motion at the glacier's base.
    Description: Swiss National Science Foundation
    Keywords: 551 ; Alpine glacier ; cryoseismology ; matched field processing ; stick‐slip tremor
    Type: article
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