Absorption und Dispersion

Wolf, Κ. L.; Herzfeld, Karl F.

doi:10.1007/978-3-642-90780-7_10

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…At first, the separation of reflection and absorption seems to be principally difficult because of the change of refractive index in the vicinity of an absorption band (anomalous dispersion). A closer inspection, based on the Drude theory of refractive index (van der Plaats, 1915;Wolf & Herzfeld, 1928), however, shows that the contribution of anomalous dispersion is negligibly small even at the highest pigment concentrations in the membrane. Accordingly, the measured signal has been corrected for reflection by subtracting the small signal obtained from a lecithin membrane without chlorophyll.…”

Section: Theorymentioning

confidence: 96%

Orientation of the porphyrin ring in artificial chlorophyll membranes

1972

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A sensitive photometric method is described by which the dichroism of lipid bilayer membranes in aqueous phase can be measured. The method is applied to black films with incorporated chlorophylla andb. With chlorophylla a relatively large dichroism is found in the Soret band and a much weaker dichroism in the red band. From the experimental data, the angles β B and β R between the "blue" and "red" transition moments and the membrane can be obtained. β B and β R are then used to calculate the angle γ of the porphyrin ring with respect to the membrane surface. For chlorophylla and three different lipids, values of γ between 44 and 49° are found.

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Section: Theorymentioning

confidence: 96%