We report on an experimental setup which has been developed to perform efficient nanosecond time-resolved coherent anti-Stokes Raman scattering (CARS) experiments using either the scanning CARS or the broadband CARS technique. A special electronic device has been constructed that allows the CARS probing laser system to be triggered with a variable delay after the excitation pulse of a nitrogen laser and furthermore prevents any temporal drifts of the nitrogen laser emission. The acquisition of the broadband CARS spectra is based on the recently developed scanning multichannel technique, which is applied in the present paper to CARS spectroscopy. Several examples of ground- and excited-state CARS spectra are shown to demonstrate the performance of the setup and to point out the benefits and limitations of the various measurement techniques. Moreover, we present CARS spectroscopic investigations of triplet relaxation processes in order to illustrate the feasibility of the designed spectrometer for nanosecond time-resolved CARS experiments.
E m m e r t , D i e f e n h a c h , E c k :[Jahrg. 60 noch 'Iz g des Oxyds zugesetzt. Nach I Stde. wurde das Reaktionsprodukt mit 20-30 ccm Benzol ausgekocht und die filtrierte Losung mit der 3-fachen Menge Petrolather (Sdp. 40 -50O) gefallt. Der Niederschlag wurde mit heiflem Ligroin gewaschen und aus heiRem Benzol unter stufenweisem Einengen umkrystallisiert. Ausbeute 0.6 g.
We report on a specially designed setup which combines the advantages of Raman difference spectroscopy with the multiplex advantages of multichannel detection. The new device and the principle of operation are described in detail. Several examples of Raman difference spectra are shown to demonstrate the performance of the setup. Static as well as scanning multichannel techniques were applied to test the distinct capabilities of the system. Both methods are discussed with special emphasis on the reliability and accuracy of the results obtained.
The reaction of dimethyl azodiformate with 1-phenylcyclopentene, 1 -phenylcyclohexene, I-(2-naphthyl)cyclopentene, I-(2-naphthyl)cyclohexene, 1-(6-rnethoxy-2-naphthy1)cyclopentene and 1-(6-methoxy-2-naphthyI)cyclohexene gives 2 : 1 (ester-olefin) adducts. The reaction mechanism of adduct formation is discussed.A convenient method of preparing six-membered heterocycles is via the Diels-Alder reaction 4 9 5 . One of the earliest examples of the Diels-Alder reaction is in fact the formation of heterocyclic system 1 by the addition of azodiformic ester to cyclopentadiene G .
Die Naphthylcyclopentene (I), die durch Grignardierung von Cyclopentanon mit Bromnaphthalinen erhalten werden, addieren 2 Mole des Azoesters (II) unter Bildung der Addukte (III), dessen Struktur mit Hilfe einer analogen Reaktion von trideuteriertem Cyclohexen zum Addukt (IV) bewiesen wird.
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