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Digitale Medien

Deuterium-NMR investigation of plant sterol effects on soybean phosphatidylcholine acyl chain ordering

Krajewski-Bertrand, M.-A. ; Milon, A. ; Hartmann, M.-A.

Amsterdam : Elsevier

Chemistry and Physics of Lipids 63 (1992), S. 235-241

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ISSN: 0009-3084

Schlagwort(e): (24R)-24-ethylcholest-5-en-3β-ol ; (24R)-24-methylcholesta-5,22E-dien-3β-ol ; (24S)-24-methyl-5α-cholest-8-en-3β-ol ; 14α,24ξ-dimethyl-9β,19-cyclo-5α-cholestan-3β-ol ; 14α,24ξ-dimethylcholest-8-en-3β-ol (8) ; 24ξ-methylcholesterol (4) ; 24ξ-methylpollinastanol (2) ; Chemical nomenclature: cholesterol (1) ; ^2H-NMR ; brassicasterol (7) ; cholest-5-en-3β-ol ; ergost-8-en-3β-ol (6) ; oriented bilayers ; plant sterol ; sitosterol (3) ; soybean phosphatidylcholine ; stigmasterol (5), (24S)-24-ethylcholesta-5,22E-dien-3β-ol

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Biologie , Chemie und Pharmazie , Physik

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0009-3084(92)90039-R

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Digitale Medien

Kinetics of photo-induced dissociation of Na clusters deposited on Mica (1993)

Balzer, F. ; Hartmann, M. ; Renger, M. ; [weitere]

Springer

The European physical journal 28 (1993), S. 321-329

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ISSN: 1434-6079

Schlagwort(e): 36.40. + d ; 32.80.Wr ; 33.80.Gj

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Na clusters bound to mica surfaces have been irradiated with pulsed and cw visible laser light. Kinetic energy and angular distributions of the Na atoms desorbing from the clusters have been determined using cw two-photon laser-induced fluorescence detection. In addition the dependence of the desorption rate on laser power, wavelength and polarization has been measured. The most probable kinetic energyE kin of the photodesorbed atoms at the surface temperatureT S =300 K was found to beE kin=18±5 meV, independent of laser irradiance (3 µJ/cm2...20 mJ/cm2) and wavelength (450 nm, 505 nm, 658 nm). With increasing orientation angle between detection axis and surface normal (0°≦Θ≦90°)E kin was observed to decrease slightly, while it was nearly independent of surface temperature betweenT S =30 K andT S =300 K. Also, with increasing radius of the Na clusters the desorbing Na atoms slowed down. The angular distribution of the Na atoms was of cos2-type with respect to the surface normal. These observations suggest that laser-induced desorption of Na from Na clusters bound to mica surfaces involves an initial rate-limiting step of direct surface plasmon excitation followed by a final step of delayed thermal desorption.