| 1. |
- Andersen, J. N., et al.
(författare)
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Differences in the Cs 4d and 5p surface and interface core-level shifts
- 1994
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Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614. ; 226:1-2, s. 106-110
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Tidskriftsartikel (refereegranskat)abstract
- Core-level binding energy shifts of Cs induced by changes in the surroundings of the Cs atoms are measured for two different Cs core levels, 5p and 4d, and are found to be different for these two levels. The surface core-level shift of Cs is found to differ by 25 meV between the two levels. In the case of the Cs core-level shifts between bulk Cs atoms and Cs atoms at an interface between Cs and an Al(111) surface the difference between the two levels is found to be as large as 60 meV. The implications of these results for the precision of the Z+1 approximation are discussed.
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| 2. |
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| 3. |
- Ardhammar, Malin, 1970, et al.
(författare)
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Absolute configuration and electronic state properties of light-switch complex [Ru(phen)2dppz]2+ deduced from oriented circular dichroism in a lamellar liquid crystal host
- 2002
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Ingår i: Chemical Physics Letters. - 0009-2614. ; 354:1-2, s. 44-50
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Tidskriftsartikel (refereegranskat)abstract
- Circular dichroism (CD) of enantiomers of [Ru(phen)(2)dppz](2+) oriented in a octanoate-decanol-water lamellar liquid crystal has been measured parallel to the orientation axis. where the sample does not exhibit linear dichroism (LD). At an inclined incidence, the emerging LD shows that the chromophores have an along-chain orientation in the liquid crystal. The changes in the CD spectrum compared to an isotropic sample, in conjunction with CD calculations, allow us to assess the absolute configuration of the enantiomers and assign the CD bands to specific electronic transitions.
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| 4. |
- Bergstrom, H, et al.
(författare)
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Detection of carbon using amplified laser-induced fluorescence
- 1989
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Ingår i: Chemical Physics Letters. - 0009-2614. ; 155, s. 27-31
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Tidskriftsartikel (refereegranskat)abstract
- Radiative lifetimes and stimulated emission have been studied in two-photon-excited carbon atoms. A strong fluorescence enhancement was detected in the direction of the exciting laser beam. Rate equations for the energy levels involved have been calculated in order to obtain number densities from the emitted light. Lifetimes were measured for the 2p3p 3p and 3D states and for the A 3[Pi]g state of the C2 molecule.
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| 5. |
- Billsten, Helena, et al.
(författare)
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Dynamics of vibrational relaxation in the S-1 state of carotenoids having 11 conjugated C=C bonds
- 2002
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Ingår i: Chemical Physics Letters. - 0009-2614. ; 355:5-6, s. 465-470
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Tidskriftsartikel (refereegranskat)abstract
- Transient absorption spectra and kinetics in the 470-650 nm region were recorded for lycopene, P-carotene and zeaxanthin, all carotenoids with 11 conjugated double bonds, in two solvents with different polarity. Analysis of the red wing of the carotenoid SI-S, transition revealed presence of a pronounced shoulder at early delay times. The kinetics recorded at this low-energy shoulder of the SI-S, transition yields an additional decay component of 500-800 fs in addition to the main S, decay. This dynamics is ascribed to a vibrational relaxation in the S, state of the carotenoids. (C) 2002 Elsevier Science B.V. All rights reserved.
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| 6. |
- Dahlbom, Mats, et al.
(författare)
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Collective excitation dynamics and polaron formation in molecular aggregates
- 2002
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Ingår i: Chemical Physics Letters. - 0009-2614. ; 364:5-6, s. 556-561
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Tidskriftsartikel (refereegranskat)abstract
- Real-space collective excitation dynamics in molecular aggregates is studied using a model where the electronic system is described via exciton theory with surface hopping. The nuclear dynamics are included using the Langevin equation where temperature and zero-point motions are entered via the fluctuation-dissipation theorem. Dynamic processes like exciton relaxation, localization, polaron formation and diffusion of self-trapped excitons, which commonly require different theories, are simultaneously described with our approach. Numerical simulations of small linear aggregates are performed. Contrary to the common view we show that exciton relaxation can temporarily increase exciton delocalization. The results are discussed based on the photosynthetic light-harvesting pigment-protein complexes. (C) 2002 Elsevier Science B.V. All rights reserved.
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| 7. |
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| 8. |
- Davidsson, A., et al.
(författare)
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New details in the polarized spectrum of naphthalene by means of linear dichroism studies in oriented polymer matrices
- 1974
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Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614. ; 28:2, s. 221-224
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Tidskriftsartikel (refereegranskat)abstract
- Linear dichroism (LD) spectra are presented for naphthalene oriented in stretched polyethylene and polypropylene matrices at 77 K and 296 K. From the calculated spectrum LD(λ)/A(λ), where A(λ) is the corrected absorbance spectrum of the sample by unpolarized light, orientational parameters are calculated and component spectra, 235–315 nm, are resolved corresponding to polarization parallel to the long (B3u = x) and the short (B2u = y) axes in the molecular plane (D2h). The orientational parameters indicate different orientational mechanisms in polyethylene and polypropylene, but the resolving procedure yields mainly identical component spectra. It is suggested that the polarization (B3u) predominating in the 245–275 nm region isdue to a B1g vibronic perturbation of the 1B2u state.
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| 9. |
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| 10. |
- Erman, P, et al.
(författare)
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Autoionization Widths of the No Rydberg-valence State Complex In the 11-12 Ev Region
- 1995
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Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614. ; 239:1-3, s. 6-10
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Tidskriftsartikel (refereegranskat)abstract
- The photoion excitation spectra of (NO)-N-14 and (NO)-N-15 have been studied in the 105-112 Mn excitation region using high-order harmonic laser spectroscopy. Utilizing the small bandwidth offered by this technique, the natural widths of prominent lines in this region have been measured. These lines originate from interactions between high-lying Rydberg levels converging to the NO+ electronic ground state and a 'new' NO valence state situated close to the latter state. The present measurements show broad resonances corresponding to a decay time of 20-50 fs. This supports the interpretation that the decay takes place via rapid electronic autoionization.
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