| 1. |
- Taylor, M. J., et al.
(författare)
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Raman investigations of indium iodide complexes : evidence for the In2I7- ion
- 2000
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Ingår i: Journal of Raman Spectroscopy. - 0377-0486 .- 1097-4555. ; 31:6, s. 465-468
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Tidskriftsartikel (refereegranskat)abstract
- Raman spectra of some indium iodide complexes were studied, including alpha- and beta-InI3 and In2I4. InI3 with KI yields K+InI4-. With CsI the spectra reveal, in addition to Cs+InI4-, the complex anion In2I7- in the solid phase CsI:2InI(3), This structure consists of InI3 groups with a linking In-I-in bridge which appears to be linear. The vibrational spectra were calculated for the dimeric In2I6 molecule at the HF, B3LYP and MP2 levels, but the structure turned out to be unstable when such calculations were attempted for In2I7-.
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| 2. |
- Afzelius, Mikael, et al.
(författare)
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Precision of single-shot dual-broadband rotational CARS thermometry with single-mode and multi-mode Nd : YAG lasers
- 2003
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Ingår i: Journal of Raman Spectroscopy. - : Wiley. - 0377-0486 .- 1097-4555. ; 34:12, s. 940-945
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Konferensbidrag (refereegranskat)abstract
- The precision of single-shot coherent anti-Stokes Raman spectroscopy (CARS) thermometry is an important characteristic for the application of CARS in various combustion devices such as internal combustion engines. It is generally assumed that the precision of CARS is directly related to the spectral noise of the interacting laser fields, and previous studies have presented a theoretical model describing the behaviour of the noise as a function of various experimental parameters. In this work, the aim was to test the results predicted by the previously developed model for dual-broadband rotational CARS. We studied the precision of evaluated temperatures in pure nitrogen under different experimental conditions, namely the dependence of precision on the gas pressure and on the linewidth of the narrowband laser (the Nd: YAG laser). It was demonstrated that our experiments reproduce the main features of the model, and that a single-mode Nd: YAG laser leads to better precision than a multi-mode Nd: YAG laser for dual-broadband rotational CARS thermometry. Copyright (C) 2003 John Wiley Sons, Ltd.
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| 3. |
- Larsson, Mina, et al.
(författare)
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Surface-enhanced Raman scattering from analytes adsorbed on gold nanoparticles inside polymer beads
- 2004
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Ingår i: Journal of Raman Spectroscopy. - : Wiley. - 0377-0486 .- 1097-4555. ; 35, s. 826-834
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Tidskriftsartikel (refereegranskat)abstract
- Porous polymer beads with a large inner area were used as a stabilizing matrix for SERS-active gold particles. A commercially available ion exchanger (SOURCETM) was used together with HAuCl4. Absorbance measurements and an x-ray diffraction study confirmed that nanocrystalline gold was obtained in the polymer beads. Transmission electron microscope measurements were performed and showed that larger nanoparticles, 20-100 nm, were obtained on the surface, whereas in the interior smaller particles, approximately 2-10 nm, could be found. Three analytes, mercaptoethanesulfonate, mercaptopropionic acid and thiocyanate, were adsorbed on the gold particles inside the polymer beads. From all analytes enhanced Raman spectra could be obtained. The distribution of analytes adsorbed on gold nanoparticles was investigated by confocal Raman spectroscopy. SERS spectra from the analytes could be observed throughout the polymer bead, indicating a fairly uniform distribution of analytes adsorbed on gold nanoparticles.
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| 4. |
- Lorén, Anders, 1974, et al.
(författare)
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Feasibility of quantitative determination of doxorubicin with surface-enhanced Raman spectroscopy
- 2001
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Ingår i: Journal of Raman Spectroscopy. - : Wiley. - 0377-0486 .- 1097-4555. ; 32:11, s. 971-974
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Tidskriftsartikel (refereegranskat)abstract
- Surface-enhanced Raman spectroscopy (SERS) was performed using excitation at 488 nm in a blood plasma-doxorubicin-silver colloid system. With a blood plasma content of 1%, a partial least-squares calibration of the doxorubicin was made in the 10-750 nM range. Predictions for a test set generated a root mean square error of prediction of 70 nM. The use of SERS and chemometrics in complex systems made it possible to use the highly informative Raman signals even at low concentrations without the need for sample pretreatment such as extraction. Copyright © 2001 John Wiley & Sons, Ltd.
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| 5. |
- Ostrovskii, Denis, 1967, et al.
(författare)
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Weak polymer-electrolyte interaction revealed by Fermi resonance perturbed Raman bands.
- 2003
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Ingår i: Journal of Raman Spectroscopy. - : Wiley. - 0377-0486 .- 1097-4555. ; 34:1, s. 40-49
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Tidskriftsartikel (refereegranskat)abstract
- A detailed analysis of isotropic and anisotropic Raman spectra of carbonyl stretching vibrations of ethylene carbonate in different systems was conducted. The variation of Fermi resonance perturbed spectral profiles was used to investigate changes in local molecular surroundings in polymer gel-electrolyte systems as a function of their composition. In poly(methyl methacrylate)-based gels it is found that the matrix interacts very weakly with the solvent molecules, ethylene and propylene carbonates, mostly playing a role of a hydrogen bond-breaking agent. In gel systems containing lithium salt, however, a new type of coordination appears. Along with the solvent-solvent and solvent-cation couplings characteristic of liquid electrolytes, the spectra of gels demonstrate the presence of mixed states in which cations, solvent molecules and polymer segments take part. The importance of the mixed states for ionic conduction is discussed. Copyright © 2002 John Wiley & Sons, Ltd.
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| 6. |
- Taylor, M. J., et al.
(författare)
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Raman investigations of indium iodide complexes : the species present in aqueous and diethyl ether solutions
- 2001
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Ingår i: Journal of Raman Spectroscopy. - : Wiley. - 0377-0486 .- 1097-4555. ; 32:12, s. 1015-1017
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Tidskriftsartikel (refereegranskat)abstract
- Raman spectra of aqueous indium (III) iodide solutions, with and without added HI, reveal an equilibrium between two species: the complex anion InI4- (nu(1) = 139 cm(-1)) and the solvated molecule InI3(H2O), (nu(sym) = 158 cm(-1)). The complex acid HInI4 is transferred from the aqueous acidic solution by solvent extraction; spectra of this species and the ether adduct InI3 (.) Et2O (nu(sym) = 151 cm(-1)) are reported.
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| 7. |
- Bood, Joakim, et al.
(författare)
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Rotational coherent anti-Stokes Raman spectroscopy (CARS) in nitrogen at high pressures (0.1-44 MPa) : Experimental and modelling results
- 2000
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Ingår i: Journal of Raman Spectroscopy. - 0377-0486. ; 31:8-9, s. 703-710
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Tidskriftsartikel (refereegranskat)abstract
- Pure rotational coherent anti-Stokes Raman scattering (CARS) has for the first time been investigated for pressures up to 44 MPa in nitrogen gas at room temperature. An atomic filter consisting of a heated cell with sodium vapour was successfully applied for suppression of stray light originating from the narrowband CARS pump laser beam. With increasing pressure the rotational CARS spectrum is smoothed gradually, and above around 10 MPa spectral lines are no longer resolvable. Experimental data were compared using Raman linewidths calculated with three different models: the energy corrected sudden scaling law (ECS), the modified exponential gap model (MEG), and a semi-classical ab initio model. All three models resulted in bad spectral fits when a linear scaling with pressure was employed. By using additional scale factors for the Raman linewidths the quality of the spectral fits and also the temperature accuracy were significantly improved. The resulting scale factors indicate a non-linear pressure dependence of the linewidths, and visualize a narrowing of the spectral envelope at the highest pressure, i.e. 44 MPa. The results indicate shortcomings in the present isolated line models and also emphasize the need for new experimental data on pure rotational Raman linewidths at high density. Copyright (C) 2000 John Wiley and Sons, Ltd.
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