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- W2008403715 abstract "The ultraviolet absorption of CN− centres is studied in NaCl, KCl, RbCl, and NaBr single crystals, as well as the ultraviolet luminescence of NaBr:CN−. At low temperatures several CN− absorption bands are resolved from the low energy tail of the ultraviolet host absorption. These bands refer to the generation of valence vibrations of the excited CN− molecule. The ultraviolet luminescence of NaBr:CN− consists of well separated nearly equidistant bands (ΔE ≈︁ 0.26 eV) in the range between 213 and 374 nm. This structure is refered to valence vibrations of the ground state CN−. The valence vibrations are described by Morse potentials. The experimental data allow the determination of the potential parameters, especially of the bond dissociation energy and of the change of the internuclear distance due to the electronic transition. Es werden die ultraviolette Absorption von CN−-Zentren in NaCl, KCl, RbCl und NaBr sowie die ultraviolette Lumineszenz von NaBr:CN− an Einkristallen untersucht. Bei tiefen Temperaturen findet man mehrere Absorptionsbanden des CN− an der langwelligen Flanke der ultravioletten Grundgitterabsorption. Diese Banden erklären sich aus der Erzeugung von Valenzschwingungen des angeregten CN−-Moleküls. Die ultraviolette Lumineszenz von NaBr:CN− besteht aus deutlich getrennten Banden (ΔE ≈︁ 0,26 eV); sie erstreckt sich über den Bereich von 213 bis 374 nm. Diese Struktur wird zurückgeführt auf die Erzeugung von Valenzschwingungen des CN− im elektronischen Grundzustand. Die Valenzschwingungen werden durch Morse-Potentiale beschrieben. Die experimentellen Daten erlauben die Bestimmung der Potential-Parameter, insbesondere der Dissoziationsenergie und der durch den elektronischen Übergang bedingten Änderung des Kernabstandes." @default.
- W2008403715 created "2016-06-24" @default.
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- W2008403715 date "1975-05-01" @default.
- W2008403715 modified "2023-10-16" @default.
- W2008403715 title "Ultraviolet absorption and emission of CN− centres in alkali halides" @default.
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- W2008403715 doi "https://doi.org/10.1002/pssb.2220690107" @default.
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