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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3968-3970 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Atomic absorption spectroscopy has been used to determine Li+ concentrations in benzoic acid after proton exchange with x- and z-cut LiNbO3 as a function of exchange time and temperature. The atomic absorption results, in agreement with our previous infrared spectroscopic and optical waveguide measurements, indicate that there is no evidence for saturation of the melt by Li+ at typical melt volumes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 64-67 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planar-optical waveguides fabricated by [1H] and [2H] hydrogen exchange on x- and z-cut lithium niobate are compared with respect to their behavior towards atmospheric [2H] and [1H] water vapor and their optical properties. The extent of [1H]–[2H] hydrogen isotopic exchange was monitored by infrared spectroscopy in the hydroxyl-group stretching region. We show that [1H]- and [2H]-exchange waveguide materials behave differently and therefore cannot be regarded as structurally identical. However, optical mode-angle measurements using prism coupling have established that the waveguide profiles in these materials are almost identical in form, and can be modeled accurately by a step-index change with Δne (approximately-equal-to)0.12 at λ=0.6328 μm. Lithium present in molten benzoic acid after its reaction with z-cut LiNbO3 samples has been determined by atomic absorption spectroscopy. The lithium concentration data obtained are in satisfactory agreement with previous estimates of hydrogen concentrations in the exchanged waveguide layer.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 85-91 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Diäthylaminowolfram(VI)-fluoride WF5NEt2, WF4(OMe)(NEt2) and WF4(OPh)(NEt2) durch Umsetzung von Trimethylsilyldiäthylamin mit WF6, WF5OMe bzw. WF5OPh dargestellt. Ihre IR- und KMR-Spektren werden mit denen anderer substituierter Wolfram(VI)-fluoride verglichen. Mit Dimethylsulfit reagieren WF5NEt2 und WF5POh offenbar jeweils zu einem Gemisch aus WF4(X)[OS(O)OMe] und WF4(X)(OMe) (X = NEt2 oder OPh).
    Notes: The diethylaminotungsten(VI) fluorides WF5NEt2, WF4(OMe)(NEt2), and WF4(OPh)(NEt2), have been prepared from reactions of trimethylsilyldiethylamine with tungsten hexafluoride, methoxy-, and phenoxytungsten(VI) pentafluorides, respectively. Their i.r. and n.m.r. spectra are reported and compared with those of other substituted tungsten(VI) fluorides. WF5NEt2 and WF5OPh undergo complex reactions with dimethyl sulphite which may be explained in terms of the formation of WF4(X)[OS(O)OMe] and WF4(X)(OMe) (X = NEt2 or OPh).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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