| 1. |
- Tjerneld, F., et al.
(författare)
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Linear Dichroism of Chloroplasts and Subchloroplast Fractions Oriented by Flow
- 1977
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Ingår i: Spectroscopy Letters. - : Informa UK Limited. - 1532-2289 .- 0038-7010. ; 10:6, s. 489-493
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Tidskriftsartikel (refereegranskat)abstract
- Chloroplasts as well as subchloroplast vesicles show linear dichroism (LD) when subjected to a hydrodynamic gradient. LD is positive for the ππ in-plane polarized bands indicating that the chlorophyll porphyrin ring is in average oriented parallel1 to the elongated membrane surfaces. The vesicle fraction enriched inphotosystem I1 shows lower LD/A at 660 nm indicating lower average orientation of chlorophyll and the fraction enriched in photosystem I shows higher LD/A at 700 nm indicating that P700 is more oriented than the bulk chlorophyll.
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| 2. |
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| 3. |
- Dahlgren, T., et al.
(författare)
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Electronic spectra of dithieno analogues of phenanthrene
- 1979
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Ingår i: Chemical Physics. - : Elsevier BV. - 0301-0104. ; 40:3, s. 397-404
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Tidskriftsartikel (refereegranskat)abstract
- The magnetic circular dichroism (MCD) spectra of some dithieno analogues of phenanthrene: benzo [2,1-b;3,4-b′] dithiophene (I) benzo [1,2-b;4,3-b′] dithiophene (II), benzo [1,2-c;3,4-c′] dithiophene (III) and benzo [1,2-b;3,4-b′] dithiophene (IV) are reported. For I–III the spectra corresponding to two different transition moment directions could be obtained from low-temperature linear dichroism spectra. The results compare well with theoretical energies, oscillator strengths, moment directions and MCD B-terms which were obtained from semi-empirical quantum mechanical calculations in the π-electron approximation.
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| 4. |
- Davidsson, A., et al.
(författare)
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A method for determination of the refractive index in a region of absorption. Anomalous dispersion of CS2 in the UV range
- 1975
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Ingår i: Chemical Physics. - : Elsevier BV. - 0301-0104. ; 8:1-2, s. 223-230
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Tidskriftsartikel (refereegranskat)abstract
- A method is described for determining the refractive index of, e.g., a liquid solution, within an absorption band by studying the linear dichroism generated by different reflections at inclined optical incidence. The method requires a sensitive differential photometric technique, such as that accomplished in a circular dichroism spectrometer.The refractive index of CS2 is reported in the region 260–450 mm. and the result compared to that obtained from a Kramers-Kronig integration on the 320 nm absorption band. Though this band is fairly isolated the experimentally gained result was found more reliable. This was due to difficulties in obtaining an accurate absorption coefficient of liquid CS2 as well as to the fact that the integration had to be restricted to a finite spectral range.
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| 5. |
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| 6. |
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| 7. |
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| 8. |
- Davidsson, A., et al.
(författare)
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Electric Dichroism Spectroscopy
- 1977
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Ingår i: Spectroscopy Letters. - : Informa UK Limited. - 1532-2289 .- 0038-7010. ; 10:6, s. 447-454
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Tidskriftsartikel (refereegranskat)abstract
- Legrand-Grosjean circular dichroism spectrometers are easily converted to detect electric dichroism (ELD), i.e. anisotropic absorption due to an external electric field. The sensitivity enables the studying of small molecules with dipole moments or anisotropic polarisabilities. The observed ELD is in part due to the orientation of the absorbing transition dipole (the orientational distribution being given by the interaction between the dipole and the electric field) but contributions due to perturbations (type Stark) may generally not be neglected. The method is predicted to become an important complement to LD studies in oriented matrix, to evaluate directions of transitions moments, but other applications are also possible. The experimental qualifications are demonstrated on two different species, nitrobenzene and Cu(II) ethylenediamine (acetylacetone)2.
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| 9. |
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| 10. |
- Davidsson, A., et al.
(författare)
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Linear Dichroism of 1,4-Benzodiazepines
- 1976
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Ingår i: Spectroscopy Letters. - : Informa UK Limited. - 1532-2289 .- 0038-7010. ; 9:5, s. 301-311
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Tidskriftsartikel (refereegranskat)abstract
- Linear dichroism and absorption spectra were measured for some 1,4-benzodiazepines dissolved and partially oriented in a polymer matrix. The results are discussed in terms of polarizations of the transitions in the two noninteracting benzene nuclei.
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