The Experts below are selected from a list of 198534 Experts worldwide ranked by ideXlab platform
Jim J Lin - One of the best experts on this subject based on the ideXlab platform.
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detailed mechanism of the ch2i o2 Reaction Yield and self Reaction of the simplest criegee intermediate ch2oo
Journal of Chemical Physics, 2014Co-Authors: Wei Lun Ting, Chunhung Chang, Hiroyuki Matsui, Yu Fang Lee, Yuanpern Lee, Jim J LinAbstract:The application of a new Reaction scheme using CH2I + O2 to generate the simplest Criegee intermediate, CH2OO, has stimulated lively research; the Criegee intermediates are extremely important in atmospheric chemistry. The detailed mechanism of CH2I + O2 is hence important in understanding kinetics involving CH2OO. We employed ultraviolet absorption to probe simultaneously CH2I2, CH2OO, CH2I, and IO in the Reaction system of CH2I + O2 upon photolysis at 248 nm of a flowing mixture of CH2I2, O2, and N2 (or SF6) in the pressure range 7.6–779 Torr to investigate the Reaction kinetics. With a detailed mechanism to model the observed temporal profiles of CH2I, CH2OO, and IO, we found that various channels of the Reaction CH2I + O2 and CH2OO + I play important roles; an additional decomposition channel of CH2I + O2 to form products other than CH2OO or ICH2OO becomes important at pressure less than 60 Torr. The pressure dependence of the derived rate coefficients of various channels of Reactions of CH2I + O2 and CH2OO + I has been determined. We derived a rate coefficient also for the self-Reaction of CH2OO as k = (8 ± 4) × 10−11 cm3 molecule−1 s−1 at 295 K. The Yield of CH2OO from CH2I + O2 was found to have a pressure dependence on N2 and O2 smaller than in previous reports; for air under 1 atm, the Yield of ∼30% is about twice of previous estimates.
Ilya A. Shkrob - One of the best experts on this subject based on the ideXlab platform.
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Reaction Yield detected magnetic resonance in exciplex systems
Molecular Physics, 1992Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:Reaction Yield detected magnetic rescnance (RYDMR) experiments are reported from separate solutions of pyrene in the presence of different electron acceptors, the three isomers of dicyanobenzene, and the electron donors, N,N-dimethyl- and N,N-diethyl-aniline. For the first time a complete set of RYDMR B 0 and B 1 spectra are provided from radical pairs in low viscosity organic solvents. The data are of high quality, due to apparatus development, and provide detailed insight into the processes occurring within the radical pair. The results have been interpreted using a stochastic Liouville equation to account for the simultaneous action of spin and molecular dynamics within the spin correlated radical pair. Two different models of the latter have been used, a simple exponential one, which allowed the influence of the electron spin exchange interaction to be investigated, and a full diffusional one, with and without a potential between the radicals. In the dicyanobenzene systems, the RYDMR behaviour is show...
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Reaction Yield detected magnetic resonance in exciplex systems. II: Time resolved and pulse studies
Molecular Physics, 1992Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:In this paper are reported novel time dependent Reaction Yield detected magnetic resonance results from exciplex systems, obtained under continuous and pulsed microwave field conditions. One pulse sequence involves creating the exciplex in the absence of the microwave radiation, and then applying it in a continuous wave fashion during the period that exciplex fluorescence occurs. A second consists of creating the exciplex in the presence of this radiation, which is then removed during the observation period. The experiments Yield extra insight into the kinetics of the spin correlated radial pairs in the systems over that reported in previous studies. The experiments have been analysed using a stochastic Liouville equation approach to the spin and molecular dynamics of the system, modelled substantially as a simple one-nucleus radical pair, and using both exponential and diffusional models of the kinetics. All the major features of the observations have been reproduced by one or other model. It has been co...
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PULSE SCHEMES IN Reaction Yield DETECTED MAGNETIC RESONANCE
The Journal of Physical Chemistry, 1991Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:Experiments are described in which the timing of a microwave pulse used to promote Reaction Yield detected magnetic resonance (RYDMR) transitions in a flash-generated spin-correlated radical pair is varied with respect to the time of the flash. Different RYDMR B 1 behavior is observed in each case, and it allows direct assessment of the lifetime of radical pairs via a kinetic analysis
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Time-resolved Reaction Yield detected magnetic resonance (RYDMR)
Chemical Physics Letters, 1991Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:Abstract Novel time-resolved Reaction Yield detected magnetic resonance studies are reported on exciplex systems consisting of pyrene and dicyanobenzene. It is shown that the fluorescence from the systems, observed under the action of a static and a resonant magnetic field, exhibits a marked variation in time, including oscillations, after the creation of the exciplex. This variation is characteristically different between the three isomers of the dicyanobenzene molecule. In a theoretical analysis, the major experimental features are reproduced and it is suggested that oscillations observed in the fluorescence decay curves may correlate with ST 0 mixing quantum beats. This experiment provides a new method for studying the spin evolution inside radical pair systems and for estimating the lifetime of the spin-correlated radical pair.
S. N. Batchelor - One of the best experts on this subject based on the ideXlab platform.
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Reaction Yield detected magnetic resonance in exciplex systems
Molecular Physics, 1992Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:Reaction Yield detected magnetic rescnance (RYDMR) experiments are reported from separate solutions of pyrene in the presence of different electron acceptors, the three isomers of dicyanobenzene, and the electron donors, N,N-dimethyl- and N,N-diethyl-aniline. For the first time a complete set of RYDMR B 0 and B 1 spectra are provided from radical pairs in low viscosity organic solvents. The data are of high quality, due to apparatus development, and provide detailed insight into the processes occurring within the radical pair. The results have been interpreted using a stochastic Liouville equation to account for the simultaneous action of spin and molecular dynamics within the spin correlated radical pair. Two different models of the latter have been used, a simple exponential one, which allowed the influence of the electron spin exchange interaction to be investigated, and a full diffusional one, with and without a potential between the radicals. In the dicyanobenzene systems, the RYDMR behaviour is show...
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Reaction Yield detected magnetic resonance in exciplex systems. II: Time resolved and pulse studies
Molecular Physics, 1992Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:In this paper are reported novel time dependent Reaction Yield detected magnetic resonance results from exciplex systems, obtained under continuous and pulsed microwave field conditions. One pulse sequence involves creating the exciplex in the absence of the microwave radiation, and then applying it in a continuous wave fashion during the period that exciplex fluorescence occurs. A second consists of creating the exciplex in the presence of this radiation, which is then removed during the observation period. The experiments Yield extra insight into the kinetics of the spin correlated radial pairs in the systems over that reported in previous studies. The experiments have been analysed using a stochastic Liouville equation approach to the spin and molecular dynamics of the system, modelled substantially as a simple one-nucleus radical pair, and using both exponential and diffusional models of the kinetics. All the major features of the observations have been reproduced by one or other model. It has been co...
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PULSE SCHEMES IN Reaction Yield DETECTED MAGNETIC RESONANCE
The Journal of Physical Chemistry, 1991Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:Experiments are described in which the timing of a microwave pulse used to promote Reaction Yield detected magnetic resonance (RYDMR) transitions in a flash-generated spin-correlated radical pair is varied with respect to the time of the flash. Different RYDMR B 1 behavior is observed in each case, and it allows direct assessment of the lifetime of radical pairs via a kinetic analysis
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Time-resolved Reaction Yield detected magnetic resonance (RYDMR)
Chemical Physics Letters, 1991Co-Authors: S. N. Batchelor, K.a. Mclauchlan, Ilya A. ShkrobAbstract:Abstract Novel time-resolved Reaction Yield detected magnetic resonance studies are reported on exciplex systems consisting of pyrene and dicyanobenzene. It is shown that the fluorescence from the systems, observed under the action of a static and a resonant magnetic field, exhibits a marked variation in time, including oscillations, after the creation of the exciplex. This variation is characteristically different between the three isomers of the dicyanobenzene molecule. In a theoretical analysis, the major experimental features are reproduced and it is suggested that oscillations observed in the fluorescence decay curves may correlate with ST 0 mixing quantum beats. This experiment provides a new method for studying the spin evolution inside radical pair systems and for estimating the lifetime of the spin-correlated radical pair.
Hiroyuki Matsui - One of the best experts on this subject based on the ideXlab platform.
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detailed mechanism of the ch2i o2 Reaction Yield and self Reaction of the simplest criegee intermediate ch2oo
Journal of Chemical Physics, 2014Co-Authors: Wei Lun Ting, Chunhung Chang, Hiroyuki MatsuiAbstract:The application of a new Reaction scheme using CH2I + O2 to generate the simplest Criegee intermediate, CH2OO, has stimulated lively research; the Criegee intermediates are extremely important in atmospheric chemistry. The detailed mechanism of CH2I + O2 is hence important in understanding kinetics involving CH2OO. We employed ultraviolet absorption to probe simultaneously CH2I2, CH2OO, CH2I, and IO in the Reaction system of CH2I + O2 upon photolysis at 248 nm of a flowing mixture of CH2I2, O2, and N2 (or SF6) in the pressure range 7.6–779 Torr to investigate the Reaction kinetics. With a detailed mechanism to model the observed temporal profiles of CH2I, CH2OO, and IO, we found that various channels of the Reaction CH2I + O2 and CH2OO + I play important roles; an additional decomposition channel of CH2I + O2 to form products other than CH2OO or ICH2OO becomes important at pressure less than 60 Torr. The pressure dependence of the derived rate coefficients of various channels of Reactions of CH2I + O2 and...
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detailed mechanism of the ch2i o2 Reaction Yield and self Reaction of the simplest criegee intermediate ch2oo
Journal of Chemical Physics, 2014Co-Authors: Wei Lun Ting, Chunhung Chang, Hiroyuki Matsui, Yu Fang Lee, Yuanpern Lee, Jim J LinAbstract:The application of a new Reaction scheme using CH2I + O2 to generate the simplest Criegee intermediate, CH2OO, has stimulated lively research; the Criegee intermediates are extremely important in atmospheric chemistry. The detailed mechanism of CH2I + O2 is hence important in understanding kinetics involving CH2OO. We employed ultraviolet absorption to probe simultaneously CH2I2, CH2OO, CH2I, and IO in the Reaction system of CH2I + O2 upon photolysis at 248 nm of a flowing mixture of CH2I2, O2, and N2 (or SF6) in the pressure range 7.6–779 Torr to investigate the Reaction kinetics. With a detailed mechanism to model the observed temporal profiles of CH2I, CH2OO, and IO, we found that various channels of the Reaction CH2I + O2 and CH2OO + I play important roles; an additional decomposition channel of CH2I + O2 to form products other than CH2OO or ICH2OO becomes important at pressure less than 60 Torr. The pressure dependence of the derived rate coefficients of various channels of Reactions of CH2I + O2 and CH2OO + I has been determined. We derived a rate coefficient also for the self-Reaction of CH2OO as k = (8 ± 4) × 10−11 cm3 molecule−1 s−1 at 295 K. The Yield of CH2OO from CH2I + O2 was found to have a pressure dependence on N2 and O2 smaller than in previous reports; for air under 1 atm, the Yield of ∼30% is about twice of previous estimates.
Wei Lun Ting - One of the best experts on this subject based on the ideXlab platform.
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detailed mechanism of the ch2i o2 Reaction Yield and self Reaction of the simplest criegee intermediate ch2oo
Journal of Chemical Physics, 2014Co-Authors: Wei Lun Ting, Chunhung Chang, Hiroyuki MatsuiAbstract:The application of a new Reaction scheme using CH2I + O2 to generate the simplest Criegee intermediate, CH2OO, has stimulated lively research; the Criegee intermediates are extremely important in atmospheric chemistry. The detailed mechanism of CH2I + O2 is hence important in understanding kinetics involving CH2OO. We employed ultraviolet absorption to probe simultaneously CH2I2, CH2OO, CH2I, and IO in the Reaction system of CH2I + O2 upon photolysis at 248 nm of a flowing mixture of CH2I2, O2, and N2 (or SF6) in the pressure range 7.6–779 Torr to investigate the Reaction kinetics. With a detailed mechanism to model the observed temporal profiles of CH2I, CH2OO, and IO, we found that various channels of the Reaction CH2I + O2 and CH2OO + I play important roles; an additional decomposition channel of CH2I + O2 to form products other than CH2OO or ICH2OO becomes important at pressure less than 60 Torr. The pressure dependence of the derived rate coefficients of various channels of Reactions of CH2I + O2 and...
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detailed mechanism of the ch2i o2 Reaction Yield and self Reaction of the simplest criegee intermediate ch2oo
Journal of Chemical Physics, 2014Co-Authors: Wei Lun Ting, Chunhung Chang, Hiroyuki Matsui, Yu Fang Lee, Yuanpern Lee, Jim J LinAbstract:The application of a new Reaction scheme using CH2I + O2 to generate the simplest Criegee intermediate, CH2OO, has stimulated lively research; the Criegee intermediates are extremely important in atmospheric chemistry. The detailed mechanism of CH2I + O2 is hence important in understanding kinetics involving CH2OO. We employed ultraviolet absorption to probe simultaneously CH2I2, CH2OO, CH2I, and IO in the Reaction system of CH2I + O2 upon photolysis at 248 nm of a flowing mixture of CH2I2, O2, and N2 (or SF6) in the pressure range 7.6–779 Torr to investigate the Reaction kinetics. With a detailed mechanism to model the observed temporal profiles of CH2I, CH2OO, and IO, we found that various channels of the Reaction CH2I + O2 and CH2OO + I play important roles; an additional decomposition channel of CH2I + O2 to form products other than CH2OO or ICH2OO becomes important at pressure less than 60 Torr. The pressure dependence of the derived rate coefficients of various channels of Reactions of CH2I + O2 and CH2OO + I has been determined. We derived a rate coefficient also for the self-Reaction of CH2OO as k = (8 ± 4) × 10−11 cm3 molecule−1 s−1 at 295 K. The Yield of CH2OO from CH2I + O2 was found to have a pressure dependence on N2 and O2 smaller than in previous reports; for air under 1 atm, the Yield of ∼30% is about twice of previous estimates.
