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Electric field effects on persistent spectral holes: Perylene in the polar polymer polyvinylbutyral (1990)

Kanaan, Y. ; Attenberger, T. ; Bogner, U. ; [et al.]

Springer

Applied physics 51 (1990), S. 336-341

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ISSN: 1432-0649

Keywords: 78.50.−w ; 61.40.−a

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We investigated the effects of an electric field on a spectral hole burned in the inhomogeneously broadened S 0–S 1 transition of perylene in different samples of the polar polymer polyvinylbutyral (PVB) and in cellulose nitrate. The spectral hole is broadened and reduced in depth by the electric field. It was checked experimentally for perylene in PVB that the hole area remains constant when an electric field is applied. We determined the effective matrix-induced electric dipole moment differences δμ* for perylene in different PVB samples and in cellulose nitrate. Within experimental accuracy the value of δμ* is approximately independent of the composition of PVB and its water content. For perylene in cellulose nitrate the value of δμ* is larger by a factor of 1.5 than in PVB. The results are discussed on the basis of a simple model for the electric field effect.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00348970

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1H NMR and molecular mechanics studies of epimeric ethyl esters of 20(R, S)-hydroxy-23-norcholanoic acids (1991)

Maier, M. S. ; Seldes, A. M. ; Gros, E. G.

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 29 (1991), S. 137-142

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ISSN: 0749-1581

Keywords: 20(R,S)-Hydroxy-23-norcholanoic acid derivatives ; 1H NMR ; Pyridine-induced shifts ; Molecular mechanics calculations ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Proton chemical shifts for the C-18, C-21, —CO2CH2CH3 and —CO2CH2CH3 protons of epimeric ethyl esters of 20(R,S)-hydroxy-23-norcholanoic acids were measured in deuteriochloroform and pyridine-d5. The observed solvent shifts due to specific OH - pyridine hydrogen-bonded complexes allowed the quantification of the epimeric mixtures by analysis of the pyridine-d5 1H NMR spectra. The main features of the pyridine-induced shifts are rationalized in terms of the preferred conformations for the 20R- and 20S-epimers, which are predicted by molecular mechanics calculations.

Additional Material: 3 Ill.