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  • Articles: DFG German National Licenses  (2)
  • 1990-1994  (1)
  • 1985-1989  (1)
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  • Articles: DFG German National Licenses  (2)
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Diffuse reflection and polarization modulation FT-IR spectrometry of surface species (1986)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 324 (1986), S. 571-578 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Two techniques for measuring the infrared spectra of adsorbed species on surfaces of different types are described. Diffuse reflectance spectra of species adsorbed on powdered substrates with a high surface area can be measured with an exceptionally high signal-to-noise ratio. The technique is illustrated by the adsorption of carbon monoxide on rhodium supported on alumina at metal loadings between 0.1 and 10%. Some doubt is cast on previous band assignments for adsorbed CO molecules. Grazing incidence reflection-absorption spectrometry can be used to measure the spectra of molecules on flat metallic substrates of very low surface area. Attempts to develop a technique for observing the intermolecular vibration between the adsorbate and the substrate using a unique triple modulation approach are discussed.
    Notes: Zusammenfassung Zwei Techniken zur Messung von Infrarot-Spektren von Adsorbaten verschiedener Art werden beschrieben. Diffuse Reflexionsspektren von Adsorbaten an pulverförmigen Substraten mit einer großen Oberfläche können mit einem außerordentlich großen Signal-zu-RauschVerhältnis gemessen werden. Als Beispiel dient die Adsorption von Kohlenstoffmonoxid an Rhodium auf Aluminiumoxid bei Metallgehalten von 0,1 bis 10%. Einige Zweifel an früheren Bandzuweisungen für adsorbierte CO-Moleküle werden geäußert. Reflexions-Absorptions-Spektrometrie mit streifendem Einfall kann zur Messung der Spektren von Molekülen an flachen metallischen Substraten mit sehr geringer Oberfläche benutzt werden. Versuche zur Entwicklung einer Technik für die Beobachtung der intermolekularen Schwingungen zwischen dem Adsorbaten und dem Substrat mittels einer einzigartigen Dreifach-Modulationstechnik werden diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00470413
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fourier transform Raman spectrometry (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 271-275 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions FT-Raman spectrometry has advanced significantly through the combination of CW Nd: YAG lasers, high sensitivity near-infrared detectors, and state-of-the-art filter technology. Obtaining fluorescence-free spectra through nearinfrared excitation has now become practical. Raman spectrometry provides data which is complementary in nature to infrared spectra and often helps provide unambiguous structural determination. Sample preparation, if necessary, is often easier than for the mid-infrared analysis. Sample categories for which Raman spectrometry can provide significant data include: aqueous soultions, catalysts [9], thin films, minerals and inorganics [10], and biological [9, 11] compounds, Typical scan times are 1 min or less. FT-Raman has truly become a powerful, general purpose analytical tool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325663
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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