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1.
Dr. Aleksander Rebane Geoffrey Wicks Dr. Mikhail Drobizhev Dr. Thomas Cooper Aleksander Trummal Dr. Merle Uudsemaa 《Angewandte Chemie (International ed. in English)》2015,54(26):7582-7586
We present a new approach for determining the strength of the dipolar solute‐induced reaction field, along with the ground‐ and excited‐state electrostatic dipole moments and polarizability of a solvated chromophore, using exclusively one‐photon and two‐photon absorption measurements. We verify the approach on two benchmark chromophores N,N‐dimethyl‐6‐propionyl‐2‐naphthylamine (prodan) and coumarin 153 (C153) in a series of toluene/dimethyl sulfoxide (DMSO) mixtures and find that the experimental values show good quantitative agreement with literature and our quantum‐chemical calculations. Our results indicate that the reaction field varies in a surprisingly broad range, 0–107 V cm?1, and that at close proximity, on the order of the chromophore radius, the effective dielectric constant of the solute–solvent system displays a unique functional dependence on the bulk dielectric constant, offering new insight into the close‐range molecular interaction. 相似文献
2.
Anneli Kruve Riin Rebane Karin Kipper Maarja-Liisa Oldekop Hanno Evard Koit Herodes Pekka Ravio Ivo Leito 《Analytica chimica acta》2015
This is the part I of a tutorial review intending to give an overview of the state of the art of method validation in liquid chromatography mass spectrometry (LC–MS) and discuss specific issues that arise with MS (and MS/MS) detection in LC (as opposed to the “conventional” detectors). The Part I briefly introduces the principles of operation of LC–MS (emphasizing the aspects important from the validation point of view, in particular the ionization process and ionization suppression/enhancement); reviews the main validation guideline documents and discusses in detail the following performance parameters: selectivity/specificity/identity, ruggedness/robustness, limit of detection, limit of quantification, decision limit and detection capability. With every method performance characteristic its essence and terminology are addressed, the current status of treating it is reviewed and recommendations are given, how to determine it, specifically in the case of LC–MS methods. 相似文献
3.
4.
Anneli Kruve Riin Rebane Karin Kipper Maarja-Liisa Oldekop Hanno Evard Koit Herodes Pekka Ravio Ivo Leito 《Analytica chimica acta》2015
This is the part II of a tutorial review intending to give an overview of the state of the art of method validation in liquid chromatography mass spectrometry (LC–MS) and discuss specific issues that arise with MS (and MS–MS) detection in LC (as opposed to the “conventional” detectors). The Part II starts with briefly introducing the main quantitation methods and then addresses the performance related to quantification: linearity of signal, sensitivity, precision, trueness, accuracy, stability and measurement uncertainty. The last section is devoted to practical considerations in validation. With every performance characteristic its essence and terminology are addressed, the current status of treating it is reviewed and recommendations are given, how to handle it, specifically in the case of LC–MS methods. 相似文献
5.
A. K. Rebane C. W. Thiel R. K. Mohan R. L. Cone 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(7):891-900
We analyze the material requirements for recording, storage, and processing of optically encoded information using coherent
optical transients in resonant solids. We introduce new figures of merit (FOM’s) that explicitly account for the ratio between
the rate of the decoherence and the rate of the spontaneous radiative decay. Highest FOM values are achieved when the decoherence
rate approaches the fundamental limit set by spontaneous emission under the condition that the total transition oscillator
strength is concentrated between a single pair of energy levels. We analyze FOM’s of some of the most promising rare-earth-doped
crystals at cryogenic temperatures. 相似文献
6.
Yu. G. Shreter D. V. Tarkhin S. A. Khorev Yu. T. Rebane 《Physics of the Solid State》1999,41(8):1295-1297
An unusual relief in the form of linear defects resembling quasicracks or grooves was observed on a compressionally stressed
surface of a bent silicon surface subjected to chemical etching. The average distance between the forming defects was determined
by the magnitude of the surface mechanical strain. The reason for this is assumed to be an Asaro-Tiller-Srolovitz instability
in the compressed-surface-etching-agent system. A simple technique is proposed for producing considerable mechanical strains,
up to 0.5%, in a silicon surface at room temperature.
Fiz. Tverd. Tela (St. Petersburg) 41, 1416–1418 (August 1999) 相似文献
7.
Two pulse photon echoes (2PPE) and photochemically accumulated stimulated photon echoes (PASPE) were measured under identical conditions for the system octaethylporphin in a polystyrene matrix. Experiments at 1.9 K show that both echoes have a different decay behavior. Whereas the 2PPE-signal decays with a time constant of 1300 ps, the PASPE-signal decays faster with a time constant of 600 ps. The different temporal behavior of both signals is tentatively attributed to spectral diffusion. 相似文献
8.
Journal of Structural Chemistry - 相似文献
9.
We use wavelength tunable femtosecond pulses to measure intrinsic (simultaneous) two-photon absorption (2PA) and three-photon absorption (3PA) molecular cross section in two series of π-conjugated dendrimers built of identical 4,4′-bis(diphenylamino) stilbene (BDPAS) and 4,4′-bis(diphenylamino) distyrylbenzene (BDPADSB) repeat units. Record large 2PA cross sections, σ2=10−46 cm4 s are obtained for the largest second-generation BDPAS-based dendrimer, as well as zeroth-generation 4-arm BDPADSB-based dendrimer. In both series, maximum 2PA cross section increases nonlinearly with the number of π-electrons, whereas for higher generations this dependence turns to linear one. 3PA cross section also increases nonlinearly with the size of the system in the series of BDPAS-based molecules, amounting a record large value, σ3=10−79 cm6 s2, for the largest, second-generation dendrimer. We interpret these results in terms of direct inter-branch conjugation, which facilitates cooperative enhancement of the nonlinear-optical response. We propose a simple model which allows us to determine the effective size of coherent domains (extent of conjugation), which, in turn, determines the optimum dendrimer size for most efficient nonlinear response. 相似文献
10.