搜索结果: 1-15 共查到“化学 Effects”相关记录57条 . 查询时间(0.301 秒)
A Theory of Intervalence Band Stark Effects
urea aggregation temperature effect orientational distribution
2016/5/24
The response of an intervalence band to an applied electric field, called an intervalence band Stark effect, is considered in detail. Because the application of an electric field to a symmetric mixed-...
Vibrational Stark Effects of Nitriles II. Physical Origins of Stark Effects from Experiment and Perturbation Models
platinum titania catalyst flame synthesis one-step oxidation screening
2016/5/23
Vibrational Stark effects, which are the effects of electric fields on vibrational spectra, were measured previously for the C−N stretch mode of several small nitriles, yielding difference dipol...
Vibrational Stark Spectroscopy of NO Bound to Heme:Effects of Protein Electrostatic Fields on the NO Stretch Frequency
rare earth alloys X-ray diffraction crystal structure phase diagram
2016/5/23
The vibrational Stark effect measures the effect of an external electric field on the vibrational (IR) spectrum of a molecule. This technique gives quantitative information on the sensitivity of a vib...
Charge Resonance Effects on Electronic Absorption Lineshapes:Application to the Heterodimer Absorption of Bacterial Photosynthetic Reaction Centers
Charge Resonance Electronic Absorption Lineshapes Heterodimer Absorption Bacterial Photosynthetic Reaction Centers
2016/5/23
The electronic absorption spectrum of the homodimeric special pair in bacterial photosynthetic reaction centers is greatly modified when one of the bacteriochlorophylls is replaced by a bacteriopheoph...
Effects of Applied Electric Fields on the Quantum Yields for the Initial Electron Transfer Steps in Bacterial Photosynthesis:II.Dynamic Stark Effect
Applied Electric Fields Quantum Yields Initial Electron Transfer Steps Bacterial Photosynthesis Dynamic Stark Effect
2016/5/23
The quantum yield of the initial charge separation steps in bacterial photosynthetic reaction centers has been shown to be reduced in an applied electric field [Part I, Lao et al., J. Phys. Chem. 97 (...
Distance Dependence of Electron-Transfer Reactions in Organized Systems:The Role of Superexchange and Non-Condon Effects in Photosynthetic Reaction Centers
Distance Dependence Electron-Transfer Reactions Organized Systems Superexchange Non-Condon Photosynthetic Reaction Centers
2016/5/23
Extremely long distance electron transfer is observed in some photosynthetic reaction centers. For several charge recombination reactions, the rate appears to fall off much more slowly with distance t...
Electric Field Effects on Emission Line Shapes when Electron Transfer Competes with Emission:an Example from Photosynthetic Reaction Centers
RHODOBACTER-SPHAEROIDES R-26 PRIMARY CHARGE SEPARATION RHODOPSEUDOMONAS-VIRIDIS BACTERIAL PHOTOSYNTHESIS FEMTOSECOND SPECTROSCOPY PROTEIN SUBUNITS 3A RESOLUTION PRIMARY DONOR SPECTRA
2016/5/23
Electron-transfer reactions are expected to be particularly sensitive to externally applied electric fields because of the presence of charge-separated, dipolar states, and the effects of the field on...
Electric Field Effects on the Initial Electron-Transfer Kinetics in Bacterial Photosynthetic Reaction Centers
solar energy inorganic, organic, physical and analytical chemistry photosynthetic reaction centers electron transfer calculation methods electric fields kinetics low temperature photochemistry chemistry 140500* -- solar energy conversion
2016/5/23
The effect of an applied electric field on the kinetics of the initial picosecond electron-transfer reaction in Rb. sphaeroides reaction centers has been measured in isotropic samples at 77 K. The net...
Effects of Buried Ionizable Amino Acids on the Reduction Potential of Recombinant Myoglobin
Buried Ionizable Amino Acids Reduction Potential Recombinant Myoglobin
2016/5/20
The temperature dependences of the reduction potentials (E degrees') of wild-type human myoglobin (Mb) and three site-directed mutants have been measured by the use of thin-layer spectroelectrochemist...
Magnetic Field Effects on Reaction Yields in the Solid-State:An Example from Photosynthetic Reaction Centers
Magnetic Field Reaction Yields in the Solid-State Photosynthetic Reaction Centers
2016/5/20
Prior to 1970there were several reports of the effects of magneticfields on chemical reactions, though there was muchrebuttal and retraction in this early literature (1-3). Since 1970, the number of r...
Electrostatically Driven Aggregation of B-Lactoglobulin (BLG) and Effects of Added Polyelectrolytes
electrostatically driven aggregation polyelectrolytes B-Lactoglobulin
2015/1/9
The aggregation rate of B-Lactoglobulin (BLG) was studied using turbidimetry and dynamic light scattering in the range 5.8
Excitonic effects from geometric order and disorder explain broadband optical absorption in eumelanin
geometric order disorder explain broadband optical absorption melanin
2014/9/24
Eumelanin is a ubiquitous biological pigment, and the origin of its broadband absorption spectrum has long been a topic of scientific debate. Here, we report a first-principles computational investiga...
Isotopic Effects on Stereodynamics for Ca+HCl, Ca+DCl, and Ca+TCl Reactions
Isotopic effect Stereodynamics Quasi-classical trajectory Vector correlation
2012/4/5
The vector correlations in Ca+HCl, Ca+DCl, and Ca+TCl reactions have been investigated by means of the quasi-classical trajectory calculations on PES constructed by means of multireference configurati...
Buckled nano rod - a two state system: quantum effects on its dynamics
Buckled nano rod quantum effects its dynamics Chemical Physics
2011/10/8
Abstract: We consider a suspended elastic rod under longitudinal compression. The compression can be used to adjust potential energy for transverse displacements from harmonic to double well regime. T...
Explaining the observed long coherence effects by 2D photon echo experiments in photosynthetic EET : Two-Component Phonon Spectrum model
2-D photon echo spectroscopy Quantum masterequations polaron transformation Dynamical disorder Novikov theorem
2011/9/8
We propose a simple stochastic model which successfully explains the long coherence effects observed in photosynthetic Excitation Energy Transport (EET) by 2D photon echo experiments of G. S. Engel et...