1000 resultados para photo-switchable
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Photograph from Fritz Gottschalk's Nazi identification papers
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Walter Reiss, 1908-1937
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Digital Image
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Photograph from Fritz Gottschalk's Nazi identification papers
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Among the various substituted coumarins investigated only 7-acetoxycoumarin is observed to photodimerize topochemically in the crystalline state and this observation may be of importance in the context of "crystal engineering".
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Walter Reiss, 1908-1937
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Ultraviolet and x-ray photoelectron spectroscopy have been employed to investigate the adsorption of methanol, ethanol, diethylether, acetaldehyde, acetone, methyl acetate and methylamine on surfaces of Fe, Ni and Cu. All these molecules adsorb molecularly at low temperatures (≤100 K). Lone pair orbitals of these molecules are stabilized on these metal surfaces (by 0·4–1·0eV) due to molecular chemisorption. The molecules generally undergo transformations as the temperature is raised to 120 K or above. The new species produced seems to depend on the metal surface. Some of the product species identified are methoxy species, formaldehyde and carbon monoxide in the case of methanol and methyl acetate, ethoxy species in the case of ethanol and 2-propanol in the case of acetone.
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Verso: Handwritten descriptions
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Digital Image
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Verso: Die Anfahrt der Gaeste zur Hochzeitsfeier von Hans u. Licie am 10. Oktober 1909
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"wurden fuer die Pfundspende gekauft. die Pfundspende gab 15000 Pakete aus und hatte 1300 ehrenamtliche Helfer"
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"50 Veranstaltungen der 'Seelischen Winterhilfe' wurden von 24000 Betreuten besucht"
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"3615 Kinder wurden zu Chanukka mit Bekleidung im Gesamtwertvon: 40000 Mark bedacht und erhielten fuer 2000 Mark Spielzeung und Suessigkeiten"
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Includes F 34652a - F 34699
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Digital image